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Papers by Perdamean Sebayang

Research paper thumbnail of Simulasi Numerik Sistem Water Oil Separator Menggunakan Software Dinamika Fluida

Piston: Journal of Technical Engineering, 2021

Computational fluid dyanamic (CFD) digunakan sebagai simulasi untuk memodelkan pemisahan multipha... more Computational fluid dyanamic (CFD) digunakan sebagai simulasi untuk memodelkan pemisahan multiphase dalam desain pemisahan diseparator. Dalam penelitian ini bertujuan untuk mengetahui pengaruh variasi kecepatan air dan minyak pada sistem water- oil separator, untuk mengetahui distribusi (kontur) kecepatan air dan minyak pada inlet sistem water-oil separator, untuk mengetahui distribusi (kontur) tekanan pada outlet dengan tekanan pada sistem water-oil separator. Dalam penelitian ini memiliki batasan pada fluida yang digunakan jenis dua fasa minyak dan air, mengunakan model aliran multiphase, pressure outlet yang digunakan 0,1 bar, tipe meshing yang digunakan tipe tetrahedral dengan ukuran 5 mm. Metode yang digunakan dalam analisa tersebut adalah perhitungan analitik dengan simulasi Computational Fluid Dyanamic (CFD). Terdapat variasi kecepatan inlet yaitu 0,264 m/s, 0,4 m/s, 0,528 m/s, 0,664 m/s, 0,8 m/s. dengan tekanan outlet 0,1 bar dengan kecepatan inle sebesar 0,264 m/s, 0,4 m/s,...

Research paper thumbnail of Synthesis and Characterization BaFe12-2xNixCoxO19 Using Chemical Coprecipitation and Variations of Calcination Temperature

1289 Synthesis and Characterization BaFe12-2xNixCoxO19 Using Chemical Coprecipitation and Variati... more 1289 Synthesis and Characterization BaFe12-2xNixCoxO19 Using Chemical Coprecipitation and Variations of Calcination Temperature Heryani Fujiati1, Kurnia Sembiring, Perdamean Sebayang, Candra Kurniawan2, Martha Rianna1 1Department of Physics, University of Sumatera Utara Padang Bulan, Medan, Indonesia 2Physics Research Center, Indonesian Institute of Sciences (P2F-LIPI) Puspiptek Region, South Tangerang, Indonesia ABSTRACT

Research paper thumbnail of Pengaruh Penambahan Serbuk Kayu Terhadap Karakteristik Keramik Cordierite Berpori Sebagai Bahan Filter Gas Buang

Preparasi bahan baku lokal MgCO3, γ-Al2O3 dan SiO2 telah dilakukan dengan cara penggilingan mengg... more Preparasi bahan baku lokal MgCO3, γ-Al2O3 dan SiO2 telah dilakukan dengan cara penggilingan menggunakan ball mill selama 48 jam, pengeringan di dalam oven pada suhu 110oC selama 24 jam, pengayakan hingga lolos 200 mesh dan kalsinasi pada suhu 1200oC. Hasil yang diperoleh berupaserbuk cordierite (2MgO.2Al2O3.5SiO2) dengan ukuran butir rata-rata sekitar 7,78 μm. Selanjutnya serbuk cordierite tersebut dicampur masing-masing dengan 10, 15, 20, 25, dan 30 % berat serbuk kayu (SK) berukuran l 100 mesh, dibentuk menjadi benda uji dengan cara cetak tuang, dan kemudiandisinter pada suhu 1250oC. Sampel yang telah disinter disebut keramik cordierite berpori yang siap dikarakterisasi untuk telaah pemakaiannya sebagai filter gas buang. Hasil karakterisasi keramik cordierite berpori menunjukkan bahwa harga densitas berkisar antara 0,75 – 1,17 g/cm3, nilai porositas: 58 – 63%, kekuatan patah: 0,5 – 2 MPa, kekerasan (Hv): 0,3 – 1,8 GPa, dan koefisien ekspansi termal: (4 – 6) x 10 –6 oC –1. Dari ide...

Research paper thumbnail of EFFECT OF Mn-Ti IONS DOPING AND SINTERING TEMPERATURE ON PROPERTIES OF BARIUM HEXAFERRITE

EFFECT OF Mn-Ti IONS DOPING AND SINTERING TEMPERATURE ON PROPERTIES OF BARIUM HEXAFERRITE . Mn-Ti... more EFFECT OF Mn-Ti IONS DOPING AND SINTERING TEMPERATURE ON PROPERTIES OF BARIUM HEXAFERRITE . Mn-Ti doped (0, 0.1, 0.4, 0.5, and 0.6 mole%-barium hexaferrite powders have been prepared from BaCO 3 , Fe 2 O 3 , TiO 2 andMnO powder by mechanical alloying technique for 20 hours. The mixture powder were grinded and then dried at 100 °C for 24 hours, followed by calcined at 1,000 °C for 2 hours. The calcined powder was then crushed into 400 mesh (38 μm) in particle size. X-Ray Diffraction analysis was performed to determine the phase formed. The powder was mixed with 3 wt%Celuna WE -518 polymer, and compressed with applied force of 5 tons. The sintering process was done at temperatures of 1100 °C and 1150 °C for 2 hours. The microstructure of sintered samples was observed by Scanning Electron Microscope - Energy Dispersive X-Ray Spectroscopy (SEM-EDS). The magnetic properties and Reflection Loss (RL) was measured by permeagraph Magnet-Physik and Vector Network Analyzer (VNA), respectively....

Research paper thumbnail of Micro-structures and magnetic properties of Mg-Al substituted in barium hexa-ferrite prepared by co-precipitation method

IOP Conference Series: Materials Science and Engineering, 2020

In this study, Mg-Al substituted barium hexa-ferrite of BaFe12-2xMgxAlxO19 (x=0-0.2) materials us... more In this study, Mg-Al substituted barium hexa-ferrite of BaFe12-2xMgxAlxO19 (x=0-0.2) materials using co-precipitation method at a calcination temperature of 1200°C for 2 hours were carried out. The precursor concentrations of the mixture were varied to identify the optimum sample. The final powder was characterized by using XRD, FE-SEM, and VSM. The XRD shows that the Mg-Al substitution was not change the micro-structures of barium hexa-ferrite. FE-SEM observation was carried out on the surface of hexagonal shape of barium hexa-ferrite. The magnetic properties shows that the decreases saturation (Ms), remanence (Mr) and coercivity (Hc). The optimum condition was obtained on x=0.2 with Ms=29.28 emu/g, Mr=15.33 emu/g, Hc=1259 Oe.

Research paper thumbnail of EFEK ADITIF FeMo DAN PROSES KALSINASI PADA SERBUK MAGNETIK BaFe12O19

Jurnal Sains Materi Indonesia, 2018

Pada penelitian ini, telah dilakukan investigasi efek aditif FeMo dan proses kalsinasi pada pembu... more Pada penelitian ini, telah dilakukan investigasi efek aditif FeMo dan proses kalsinasi pada pembuatan magnet permanen barium heksaferit (BaFe 12 O 19). Proses pembuatan magnet barium heksaferit dilakukan dengan metode mechanical alloying. Serbuk hasil mixing antara BaFe 12 O 19 dan FeMo dikalsinasi dengan variasi suhu kalsinasi 1000 o C dan 1200 o C. Karakterisasi yang dilakukan meliputi sifat fisis dan magnetik, dengan menggunakan X-Ray Diffraction (XRD) dan piknometeruntuk mengetahui fasa dan nilai densitas magnet, serta menggunakanVibrating Sample Magnetometer (VSM) pada pengukuran sifat magnetik magnet barium heksaferit. Dari hasil eksperimen, dapat diketahui bahwa penambahan aditif FeMo dapat menaikkan nilai densitas pada serbuk barium heksaferit. Hasil analisis sifat magnetik, dapat diketahui bahwa penambahan aditif FeMo secara keseluruhan menurunkan sifat magnetik magnet. Namun penambahan %wt FeMo menaikkan nilai remanensi, saturasi dan energi produk maksimum (BH max) magnet barium heksaferit, meskipun nilai koersivitas magnet tetap menurun. Sedangkan kenaikan suhu kalsinasi mampu menaikkan nilai remanensi, dan BH max , namun menurunkan nilai koersivitas dan saturasi dari magnet barium heksaferit. Hal ini menunjukkan penambahan zat aditif FeMo mampu mengubah struktur material magnet permanen barium heksaferit dari hard magnetik menjadi soft magnetik material. Nilai optimum dihasilkan pada komposisi penambahan 5 %wt aditif FeMo dengan nilai densitas serbuk 3,71 g/cm 3 sebelum dikalsinasi, dan memiliki sifat magnetik seperti: saturasi 2,12 kG, remanensi 1,15 kG, koersivitas 0,45 kOe dan BH max 0,145 MGOe setelah dikalsinasi pada suhu 1000 o C.

Research paper thumbnail of The effect of ammonia solution concentration on the synthesis process of MgFe2O4 based on natural iron sand as adsorbent of Pb ions

INTERNATIONAL CONFERENCE ON TRENDS IN MATERIAL SCIENCE AND INVENTIVE MATERIALS: ICTMIM 2020, 2020

Research paper thumbnail of TEKANAN UDARA DALAM PROSES CURING PADA PEMBUATAN MAGNET PERMANEN BONDED NdFeB

PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2017 UNJ, 2017

Dalam penelitian ini telah dilakukan investigasi efek tekanan udara pada proses curing terhadap s... more Dalam penelitian ini telah dilakukan investigasi efek tekanan udara pada proses curing terhadap sifat fisis dan magnetik material magnet permanen bonded NdFeB. Proses sintesis bonded magnet dilakukan dengan metode compression molding dengan campuran perekat epoxy 3 wt%. Proses pencetakan dilakukan secara uniaxial dengan tekanan 200 MPa. Efek tekanan udara pada proses curing divariasiasikan sebesar 10, 200, dan 500 mbar, sementara temperatur curing dijaga konstan pada suhu 150 o C selama 2 jam. Dari hasil eksperimen diketahui bahwa nilai densitas bulk yang diperoleh meningkat dengan meningkatnya tekanan udara. Sifat kemagnetan material bonded NdFeB juga semakin meningkat sebanding dengan peningkatan tekanan udaranya dengan nilai densitas fluks magnetik terbesar mencapai 1045 G. Namun demikian, nilai kekerasan pada magnet bonded NdFeB berbanding terbalik terhadap tekanan udara dengan nilai kekerasan tertinggi sebesar 167,8 Hv pada tekanan udara 10 mbar.

Research paper thumbnail of Fluid Dynamics Properties of Barium Hexaferrite Particle

Jurnal Fisika Indonesia, 2014

Particle size distribution of Barium Hexaferrite sample has been performed with commonly used met... more Particle size distribution of Barium Hexaferrite sample has been performed with commonly used methods of mathematical models by Rosin-Rammler (RR model) distribution. By using sieving method from 20-400 mesh, the basis of network analysis distribution function F(d) and density function, f(d) were obtained. Particle size estimation was performed using sedimentation gravitation based on Stokes law to obtained Reynolds numbers and terminal velocity of flocs in medium value has been calculated. The results of Reynolds numbers shows that Barium hexaferrite flocs in ethanol medium in laminar flow, whereas terminal velocity increases as larger particle size and density, however, bulk density reduce due to contained highly porous in the sample which yields lower bulk density. The relationship of turbidity with the floc size has been evaluated. The results show that turbidity and bulk density increases as smaller particle size, meanwhile, terminal velocity reduced. Differences in turbidity f...

Research paper thumbnail of Synthesized of PEG-6000 coated MgFe2O4nanoparticles based on natural iron sand by co-precipitation method

IOP Conference Series: Materials Science and Engineering, 2018

The polymer coated Magnesium Ferrite nanoparticles (MgFe2O4) based on natural iron sand, Mg(CH3CO... more The polymer coated Magnesium Ferrite nanoparticles (MgFe2O4) based on natural iron sand, Mg(CH3COO)2.4H2O, and PEG-6000 have been successfully prepared by coprecipitation method. The mass variation of PEG-6000 content was from 0 to 12 gram. It was prepared at synthesize temperature of 70 o C. The PEG coating reduced the effect of agglomeration, so the coercivity value can be closed to soft magnets. The nanoparticle of synthesized has MgFe2O4 single phase and cubic spinel structure. The bonding of MgFe2O4 and PEG-6000 as a coating material was confirmed by FTIR curve. The MgFe2O4 density decreased with the increasing of PEG 6000 content. On the other hand, the coercivity value was slightly reduced as the addition of PEG-6000, with the lowest value was obtained on 8 gram PEG content. The optimum condition is obtained at addition of 8 gram PEG 6000 to MgFe2O4, with coercivity, saturation, and remanence are 198.41 Oe, 52.53 emu/g, and 8.51 emu/g, respectively. So that, the sample is widely used as absorbance material of heavy metal.

Research paper thumbnail of Pengaruh Jumlah Sudu Turbin Angin Savonius Terhadap Unjuk Kerja Generator (Single Phase) Magnet Permanen NdFeB

PISTON: Journal of Technical Engineering, 2019

Telah berhasil dibuat disain dan konstruksi turbin angin savoniuspada generator (single phase)mag... more Telah berhasil dibuat disain dan konstruksi turbin angin savoniuspada generator (single phase)magnet permanen NdFeB. Variasi jumlah sudu turbin masing-masing dibuat sebanyak 4, 8 dan 16 buah, dengan sumber fluida(angin) yangberasaldari turbo fan (220V/50Hz – 98W). Pada penelitian ini akan dilihat korelasi antara kecepaatan angin terhadap kecepatan putar generator, output tegangaan tanpa dan dengan beban lampu LED5W, arus listrik dan daya listrik yang dihasilkan generator tersebut. Hasil unjuk kerjagenerator (single phase)magnet permanen NdFeBterhadap pengaruh jumlah sudu turbin relatif linier, baik terhadap kecepatan putar generator, output tegangan, arus dan daya listrik. Korelasi ini menunjukkan bahwa kondisi optimum diperoleh pada kecepatan angin 6,5 m/s dan jumlah sudu turbin sebanyak 16 buah, masing-masing menghasilkan kecepatan putar generator, output tegangan tanpa dan dengan beban, arus dan daya listrik adalah 120rpm, 44,3V, 109,8V, 100mA dan 4W. Generator (single phase)magn...

Research paper thumbnail of The effect of tetraethyl orthosilicate (TEOS) additions as silica precursors on the magnetite nano-particles (Fe3O4) properties for the application of ferro-lubricant

Journal of Molecular Liquids, 2019

Abstract In this research, the effects of tetraethyl orthosilicate (TEOS) variations on the magne... more Abstract In this research, the effects of tetraethyl orthosilicate (TEOS) variations on the magnetite (Fe3O4) nano-particles were examined. The research was conducted to find the optimum TEOS additions as the silica precursors to modify the surface of the magnetite nano-particles into oleo-philic to improve the dispersion stability of the particles in the lubricant. Another purpose is to reduce the agglomerations as a result of the super-paramagnetism behaviour of the magnetite nano-particles. The TEOS additions in the mixed-solution were varied as follows: 1.2 ml and 2.5 ml. XRD analysis confirmed that the phase remains unchanged (single phase of Fe3O4). However, the coating process increases its particle size as suggested by TEM images and histogram analysis from 71 nm (uncoated) to 126 nm (silica coated). The results of the FTIR conditions suggested that a new absorption occurs at a wave number of 1058 cm−1 that indicated the stretching vibration of Si-O-Si. The magnetic properties analysis using VSM suggested that the additions of TEOS decreases the magnetic saturation value of the magnetite nano-particles. Zeta potential analysis suggested that the value is -62 mV that can be classified as a good dispersion stability colloid to be used for ferro-lubricant application.

Research paper thumbnail of The effect of magnetic nano-fluids (Fe3O4) on the heat transfer enhancement in a pipe with laminar flow

Heat and Mass Transfer, 2019

In this research, the effect of magnetic nano-fluids (Fe3O4) on the heat transfer enhancement in ... more In this research, the effect of magnetic nano-fluids (Fe3O4) on the heat transfer enhancement in a pipe with laminar flows (Re numbers of 171, 228 and 285) were examined. Different heats (15.75 and 20.6 W) were applied to an acrylic pipe to analyse the effect of magnetic nano-fluids for transferring the heat and reducing the wall temperature on a non-metal material pipe. Variations of nano-particles (volume percentage) were used in the nano-fluids solution: 2, 3 and 4%, respectively. The magnetic nano-fluids (Fe3O4) were prepared from 32.5 g of FeCl3.6H2O (ferric chloride) and 12.7 g of FeCl2.4 H2O (ferrous chloride) by using a co-precipitation method. The material characterisations using XRD and FE-SEM confirmed that Fe3O4 single phase occurred and shown that the average size diameters of the nano-particles are within a range of 20-40 nm. The experimental results suggested that the cooling capability can be enhanced by adding magnetic nano-particles controlled by permanent magnet and increasing the heat transfer in the magnetic nano-fluids system. The aggregation of the magnetic nano-particles following the magnetic field applied from the permanent magnet increases the convection heat transfer from the heating source to the nano-fluids, and thus reducing the wall temperature of the acrylic pipe.

Research paper thumbnail of Preparation of Fe3O4/Bentonite Nanocomposite from Natural Iron Sand by Co-precipitation Method for Adsorbents Materials

IOP Conference Series: Materials Science and Engineering, 2018

An adsorption method is one of the effective ways to filter the heavy metals wastes in aqueous sy... more An adsorption method is one of the effective ways to filter the heavy metals wastes in aqueous system. In this paper, the Fe 3 O 4 /bentonite nanocomposites were successfully prepared from natural iron sand by co-precipitation method. The chemical process was carried out by dissolving and hot stirring the milled iron sand and bentonite in acid solution and precipitating it by NH 4 OH. The sediment was then washed using distilled water to neutralize pH and dried at 100 °C for 5 hours to produce Fe 3 O 4 /bentonite powders. The samples were characterized by XRD, FTIR, BET, TEM, VSM and AAS. All samples were composed by Fe 3 O 4 single phase with a spinnel structure and lattice parameter of 8.373 Å. The transmittance peak of FTIR curve proved that the Fe 3 O 4 particles and bentonite had a molecular bonding. The addition of bentonite to Fe 3 O 4 nanoparticles generally reduced the magnetic properties of Fe 3 O 4 /bentonite nanocomposites. The optimum condition of 30 wt% bentonite resulted 105.9 m 2 /g in surface area, 14 nm in an average particle size and 3.2 nm in pore size. It can be used as Cu and Pb adsorbent materials.

Research paper thumbnail of Natural iron sand-based Mg1-xNixFe2O4 nanoparticles as potential adsorbents for heavy metal removal synthesized by co-precipitation method

IOP Conference Series: Earth and Environmental Science, 2019

Natural iron sand-based Mg1-xNixFe2O4 magnetic nanoparticles (x = 0.25, 0.50, 0.75) were synthesi... more Natural iron sand-based Mg1-xNixFe2O4 magnetic nanoparticles (x = 0.25, 0.50, 0.75) were synthesized using a simple co-precipitation method. The resulting nanoparticles were characterized by X-Ray Diffraction, Vibrating Sample Magnetometer, Energy Dispersive X-Ray Analysis, Atomic Absorption Spectroscopy and Scanning Electron Microscopy. The crystallite size data of the Mg1-xNixFe2O4 revealed that all samples with varied x lie under 17 nm; with x = 0.5 variation having the least crystallite size of 14.90 nm. The surface microstructure elucidation by SEM also confirmed the presence of agglomeration at x = 0.5. Optimal condition of magnetic properties was observed in Mg1-xNixFe2O4 (x = 0.75), as was displayed by the M-H curves. The adsorption capacity up to 190.5 mg/g implies that Mg1-xNixFe2O4 nanoparticles have the ability to emerge as one of the beneficial adsorbents for the removal of heavy metal ions, mainly Pb and Cu ions.

Research paper thumbnail of Heat pipes as a passive cooling system for flywheel energy storage application

Journal of Physics: Conference Series, 2019

In this research, the effects of the heat pipes arrangement as a passive cooling system in an ele... more In this research, the effects of the heat pipes arrangement as a passive cooling system in an electric motor for the flywheel energy storage application were analysed. Two heat pipes variations were used and attached to the outer surface of the electric motor, 4 and 6 heat pipes arrangements, respectively. The test was also compared with the condition where no heat pipes attached. A numerical model was developed to simulate the temperature distribution on the electric motor. An analytical model was also used to calculate the effect of the fin length to the heat transfer capability of the heat pipes. The test result suggested that the heat pipes can be used as a passive cooling system and could reduce the temperature on the surface of the electric motor significantly. The arrangement with 6 heat pipes has the highest temperature reduction from 50 to 35  C as compared to other conditions. The numerical simulation has a good agreement with the experimental results conducted in the laboratory and was used as validations for the model. The analytical model suggested that the increase of the fin length in one heat pipe affects the heat transfer surface area and thus the heat dissipation can be enhanced.

Research paper thumbnail of The effect of FeMn and FeB additive on hematite (α-Fe2O3) and their characterization

Journal of Physics: Conference Series, 2019

In this study, the mineral material addition of FeMn and FeB to the hematite (α-Fe2O3) by varying... more In this study, the mineral material addition of FeMn and FeB to the hematite (α-Fe2O3) by varying each mass concentration of 0, 4, and 8 wt.% have been prepared by powder metallurgy method. The mixing process of the powder was done by high energy milling (HEM) for 1 h. Then, the powders were calcined at temperature of 1000 ºC for 2 h. The Effect of FeMn and FeB additives on α-Fe2O3 causes the increasing of the particles diameter. The increasing of FeMn additive increases the powder density of material, but the addition of FeB decreases it. The material of α-Fe2O3with FeMn additive has dominant phases of α-Fe2O3 and the minor phases of MnO2 and Fe3O4. The material of α-Fe2O3 with FeB additive has two phases as magnetite (Fe3O4) and hematite (α-Fe2O3). The magnetic properties of a α-Fe2O3 material with FeMn and FeB additives decrease the saturation value and coercivity.

Research paper thumbnail of Effect of Calcination Temperature on Microsturctures, Magnetic Properties, and Microwave Absorption on BaFe11.6Mg0.2Al0.2O19 Synthesized From Natural Iron Sand

Case Studies in Thermal Engineering, 2019

Abstract The syntheses of BaFe11.6Mg0.2Al0.2O19 with calcination temperature variations of 900, 1... more Abstract The syntheses of BaFe11.6Mg0.2Al0.2O19 with calcination temperature variations of 900, 1050, and 1200 °C were conducted through a co-precipitation method to be used as Radar Absorbing Material. The raw materials used in the syntheses were: BaCl2, MgCl2, AlCl3 and natural iron sand from Kata Beach-Sumatera Barat, Indonesia. The material was characterized using XRD, FE-SEM, VSM, and VNA. The results confirmed that the structure of the barium hexaferrite crystal did not change due to the effect of calcination temperature. The optimum conditions properties obtained for BaFe11.6Mg0.2Al0.2O19 at a calcination temperature of 900 °C, Ms = 20.64 emu g−1, Mr = 9.89 emu g−1, Hc = 1708 Oe, and BHmax = 45800 GOe, respectively. In addition, the maximum reflection loss and the microwave absorption values obtained were − 58.60 dB and 99.99% at a frequency of 10.91 GHz.

Research paper thumbnail of Effects of Sintering Holding Time on the Structural, Electrical and Magnetic Properties of Zn0.95Ni0.05O

IOP Conference Series: Materials Science and Engineering, 2017

View the article online for updates and enhancements. Related content Effect of sintering tempera... more View the article online for updates and enhancements. Related content Effect of sintering temperature on the microstructure, electrical and magnetic properties of Zn0.98 Mn0.02O material K Sebayang, D Aryanto, S Simbolon et al.-Structural and Magnetic Properties of Codoped ZnO based Diluted Magnetic Semiconductors Li Bin-Bin, Shen Hong-Lie, Zhang Rong et al.-Structural and magnetic properties CuAl1-xCrxS2 alloys

Research paper thumbnail of Effect of Cu-Dopant on the Structural, Magnetic and Electrical Properties of ZnO

IOP Conference Series: Materials Science and Engineering, 2017

Zn 1-x Cu x O (x = 0, 2, 3, and 4 at.%) was synthesized by using solid-state reaction technique. ... more Zn 1-x Cu x O (x = 0, 2, 3, and 4 at.%) was synthesized by using solid-state reaction technique. The ZnO and CuO powders were mixed and then milled by using high-speed shaker mill. The influence of Cu dopants on the structure, magnetic, and electrical properties was investigated by using XRD, VSM, and I-V and C-V measurements. The XRD analysis showed that the Zn 1-x Cu x O had hexagonal wurtzite polycrystalline. The diffraction intensity decreased and the peak position shifted directly to a higher 2θ angle with increasing the dopant concentration. Furthermore, the lattice parameters decreased when the ZnO was doped with x = 0.04, which indicated that the crystal structure changed. The increase of Cu dopants was believed to affect the magnetic and electrical properties of ZnO.

Research paper thumbnail of Simulasi Numerik Sistem Water Oil Separator Menggunakan Software Dinamika Fluida

Piston: Journal of Technical Engineering, 2021

Computational fluid dyanamic (CFD) digunakan sebagai simulasi untuk memodelkan pemisahan multipha... more Computational fluid dyanamic (CFD) digunakan sebagai simulasi untuk memodelkan pemisahan multiphase dalam desain pemisahan diseparator. Dalam penelitian ini bertujuan untuk mengetahui pengaruh variasi kecepatan air dan minyak pada sistem water- oil separator, untuk mengetahui distribusi (kontur) kecepatan air dan minyak pada inlet sistem water-oil separator, untuk mengetahui distribusi (kontur) tekanan pada outlet dengan tekanan pada sistem water-oil separator. Dalam penelitian ini memiliki batasan pada fluida yang digunakan jenis dua fasa minyak dan air, mengunakan model aliran multiphase, pressure outlet yang digunakan 0,1 bar, tipe meshing yang digunakan tipe tetrahedral dengan ukuran 5 mm. Metode yang digunakan dalam analisa tersebut adalah perhitungan analitik dengan simulasi Computational Fluid Dyanamic (CFD). Terdapat variasi kecepatan inlet yaitu 0,264 m/s, 0,4 m/s, 0,528 m/s, 0,664 m/s, 0,8 m/s. dengan tekanan outlet 0,1 bar dengan kecepatan inle sebesar 0,264 m/s, 0,4 m/s,...

Research paper thumbnail of Synthesis and Characterization BaFe12-2xNixCoxO19 Using Chemical Coprecipitation and Variations of Calcination Temperature

1289 Synthesis and Characterization BaFe12-2xNixCoxO19 Using Chemical Coprecipitation and Variati... more 1289 Synthesis and Characterization BaFe12-2xNixCoxO19 Using Chemical Coprecipitation and Variations of Calcination Temperature Heryani Fujiati1, Kurnia Sembiring, Perdamean Sebayang, Candra Kurniawan2, Martha Rianna1 1Department of Physics, University of Sumatera Utara Padang Bulan, Medan, Indonesia 2Physics Research Center, Indonesian Institute of Sciences (P2F-LIPI) Puspiptek Region, South Tangerang, Indonesia ABSTRACT

Research paper thumbnail of Pengaruh Penambahan Serbuk Kayu Terhadap Karakteristik Keramik Cordierite Berpori Sebagai Bahan Filter Gas Buang

Preparasi bahan baku lokal MgCO3, γ-Al2O3 dan SiO2 telah dilakukan dengan cara penggilingan mengg... more Preparasi bahan baku lokal MgCO3, γ-Al2O3 dan SiO2 telah dilakukan dengan cara penggilingan menggunakan ball mill selama 48 jam, pengeringan di dalam oven pada suhu 110oC selama 24 jam, pengayakan hingga lolos 200 mesh dan kalsinasi pada suhu 1200oC. Hasil yang diperoleh berupaserbuk cordierite (2MgO.2Al2O3.5SiO2) dengan ukuran butir rata-rata sekitar 7,78 μm. Selanjutnya serbuk cordierite tersebut dicampur masing-masing dengan 10, 15, 20, 25, dan 30 % berat serbuk kayu (SK) berukuran l 100 mesh, dibentuk menjadi benda uji dengan cara cetak tuang, dan kemudiandisinter pada suhu 1250oC. Sampel yang telah disinter disebut keramik cordierite berpori yang siap dikarakterisasi untuk telaah pemakaiannya sebagai filter gas buang. Hasil karakterisasi keramik cordierite berpori menunjukkan bahwa harga densitas berkisar antara 0,75 – 1,17 g/cm3, nilai porositas: 58 – 63%, kekuatan patah: 0,5 – 2 MPa, kekerasan (Hv): 0,3 – 1,8 GPa, dan koefisien ekspansi termal: (4 – 6) x 10 –6 oC –1. Dari ide...

Research paper thumbnail of EFFECT OF Mn-Ti IONS DOPING AND SINTERING TEMPERATURE ON PROPERTIES OF BARIUM HEXAFERRITE

EFFECT OF Mn-Ti IONS DOPING AND SINTERING TEMPERATURE ON PROPERTIES OF BARIUM HEXAFERRITE . Mn-Ti... more EFFECT OF Mn-Ti IONS DOPING AND SINTERING TEMPERATURE ON PROPERTIES OF BARIUM HEXAFERRITE . Mn-Ti doped (0, 0.1, 0.4, 0.5, and 0.6 mole%-barium hexaferrite powders have been prepared from BaCO 3 , Fe 2 O 3 , TiO 2 andMnO powder by mechanical alloying technique for 20 hours. The mixture powder were grinded and then dried at 100 °C for 24 hours, followed by calcined at 1,000 °C for 2 hours. The calcined powder was then crushed into 400 mesh (38 μm) in particle size. X-Ray Diffraction analysis was performed to determine the phase formed. The powder was mixed with 3 wt%Celuna WE -518 polymer, and compressed with applied force of 5 tons. The sintering process was done at temperatures of 1100 °C and 1150 °C for 2 hours. The microstructure of sintered samples was observed by Scanning Electron Microscope - Energy Dispersive X-Ray Spectroscopy (SEM-EDS). The magnetic properties and Reflection Loss (RL) was measured by permeagraph Magnet-Physik and Vector Network Analyzer (VNA), respectively....

Research paper thumbnail of Micro-structures and magnetic properties of Mg-Al substituted in barium hexa-ferrite prepared by co-precipitation method

IOP Conference Series: Materials Science and Engineering, 2020

In this study, Mg-Al substituted barium hexa-ferrite of BaFe12-2xMgxAlxO19 (x=0-0.2) materials us... more In this study, Mg-Al substituted barium hexa-ferrite of BaFe12-2xMgxAlxO19 (x=0-0.2) materials using co-precipitation method at a calcination temperature of 1200°C for 2 hours were carried out. The precursor concentrations of the mixture were varied to identify the optimum sample. The final powder was characterized by using XRD, FE-SEM, and VSM. The XRD shows that the Mg-Al substitution was not change the micro-structures of barium hexa-ferrite. FE-SEM observation was carried out on the surface of hexagonal shape of barium hexa-ferrite. The magnetic properties shows that the decreases saturation (Ms), remanence (Mr) and coercivity (Hc). The optimum condition was obtained on x=0.2 with Ms=29.28 emu/g, Mr=15.33 emu/g, Hc=1259 Oe.

Research paper thumbnail of EFEK ADITIF FeMo DAN PROSES KALSINASI PADA SERBUK MAGNETIK BaFe12O19

Jurnal Sains Materi Indonesia, 2018

Pada penelitian ini, telah dilakukan investigasi efek aditif FeMo dan proses kalsinasi pada pembu... more Pada penelitian ini, telah dilakukan investigasi efek aditif FeMo dan proses kalsinasi pada pembuatan magnet permanen barium heksaferit (BaFe 12 O 19). Proses pembuatan magnet barium heksaferit dilakukan dengan metode mechanical alloying. Serbuk hasil mixing antara BaFe 12 O 19 dan FeMo dikalsinasi dengan variasi suhu kalsinasi 1000 o C dan 1200 o C. Karakterisasi yang dilakukan meliputi sifat fisis dan magnetik, dengan menggunakan X-Ray Diffraction (XRD) dan piknometeruntuk mengetahui fasa dan nilai densitas magnet, serta menggunakanVibrating Sample Magnetometer (VSM) pada pengukuran sifat magnetik magnet barium heksaferit. Dari hasil eksperimen, dapat diketahui bahwa penambahan aditif FeMo dapat menaikkan nilai densitas pada serbuk barium heksaferit. Hasil analisis sifat magnetik, dapat diketahui bahwa penambahan aditif FeMo secara keseluruhan menurunkan sifat magnetik magnet. Namun penambahan %wt FeMo menaikkan nilai remanensi, saturasi dan energi produk maksimum (BH max) magnet barium heksaferit, meskipun nilai koersivitas magnet tetap menurun. Sedangkan kenaikan suhu kalsinasi mampu menaikkan nilai remanensi, dan BH max , namun menurunkan nilai koersivitas dan saturasi dari magnet barium heksaferit. Hal ini menunjukkan penambahan zat aditif FeMo mampu mengubah struktur material magnet permanen barium heksaferit dari hard magnetik menjadi soft magnetik material. Nilai optimum dihasilkan pada komposisi penambahan 5 %wt aditif FeMo dengan nilai densitas serbuk 3,71 g/cm 3 sebelum dikalsinasi, dan memiliki sifat magnetik seperti: saturasi 2,12 kG, remanensi 1,15 kG, koersivitas 0,45 kOe dan BH max 0,145 MGOe setelah dikalsinasi pada suhu 1000 o C.

Research paper thumbnail of The effect of ammonia solution concentration on the synthesis process of MgFe2O4 based on natural iron sand as adsorbent of Pb ions

INTERNATIONAL CONFERENCE ON TRENDS IN MATERIAL SCIENCE AND INVENTIVE MATERIALS: ICTMIM 2020, 2020

Research paper thumbnail of TEKANAN UDARA DALAM PROSES CURING PADA PEMBUATAN MAGNET PERMANEN BONDED NdFeB

PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2017 UNJ, 2017

Dalam penelitian ini telah dilakukan investigasi efek tekanan udara pada proses curing terhadap s... more Dalam penelitian ini telah dilakukan investigasi efek tekanan udara pada proses curing terhadap sifat fisis dan magnetik material magnet permanen bonded NdFeB. Proses sintesis bonded magnet dilakukan dengan metode compression molding dengan campuran perekat epoxy 3 wt%. Proses pencetakan dilakukan secara uniaxial dengan tekanan 200 MPa. Efek tekanan udara pada proses curing divariasiasikan sebesar 10, 200, dan 500 mbar, sementara temperatur curing dijaga konstan pada suhu 150 o C selama 2 jam. Dari hasil eksperimen diketahui bahwa nilai densitas bulk yang diperoleh meningkat dengan meningkatnya tekanan udara. Sifat kemagnetan material bonded NdFeB juga semakin meningkat sebanding dengan peningkatan tekanan udaranya dengan nilai densitas fluks magnetik terbesar mencapai 1045 G. Namun demikian, nilai kekerasan pada magnet bonded NdFeB berbanding terbalik terhadap tekanan udara dengan nilai kekerasan tertinggi sebesar 167,8 Hv pada tekanan udara 10 mbar.

Research paper thumbnail of Fluid Dynamics Properties of Barium Hexaferrite Particle

Jurnal Fisika Indonesia, 2014

Particle size distribution of Barium Hexaferrite sample has been performed with commonly used met... more Particle size distribution of Barium Hexaferrite sample has been performed with commonly used methods of mathematical models by Rosin-Rammler (RR model) distribution. By using sieving method from 20-400 mesh, the basis of network analysis distribution function F(d) and density function, f(d) were obtained. Particle size estimation was performed using sedimentation gravitation based on Stokes law to obtained Reynolds numbers and terminal velocity of flocs in medium value has been calculated. The results of Reynolds numbers shows that Barium hexaferrite flocs in ethanol medium in laminar flow, whereas terminal velocity increases as larger particle size and density, however, bulk density reduce due to contained highly porous in the sample which yields lower bulk density. The relationship of turbidity with the floc size has been evaluated. The results show that turbidity and bulk density increases as smaller particle size, meanwhile, terminal velocity reduced. Differences in turbidity f...

Research paper thumbnail of Synthesized of PEG-6000 coated MgFe2O4nanoparticles based on natural iron sand by co-precipitation method

IOP Conference Series: Materials Science and Engineering, 2018

The polymer coated Magnesium Ferrite nanoparticles (MgFe2O4) based on natural iron sand, Mg(CH3CO... more The polymer coated Magnesium Ferrite nanoparticles (MgFe2O4) based on natural iron sand, Mg(CH3COO)2.4H2O, and PEG-6000 have been successfully prepared by coprecipitation method. The mass variation of PEG-6000 content was from 0 to 12 gram. It was prepared at synthesize temperature of 70 o C. The PEG coating reduced the effect of agglomeration, so the coercivity value can be closed to soft magnets. The nanoparticle of synthesized has MgFe2O4 single phase and cubic spinel structure. The bonding of MgFe2O4 and PEG-6000 as a coating material was confirmed by FTIR curve. The MgFe2O4 density decreased with the increasing of PEG 6000 content. On the other hand, the coercivity value was slightly reduced as the addition of PEG-6000, with the lowest value was obtained on 8 gram PEG content. The optimum condition is obtained at addition of 8 gram PEG 6000 to MgFe2O4, with coercivity, saturation, and remanence are 198.41 Oe, 52.53 emu/g, and 8.51 emu/g, respectively. So that, the sample is widely used as absorbance material of heavy metal.

Research paper thumbnail of Pengaruh Jumlah Sudu Turbin Angin Savonius Terhadap Unjuk Kerja Generator (Single Phase) Magnet Permanen NdFeB

PISTON: Journal of Technical Engineering, 2019

Telah berhasil dibuat disain dan konstruksi turbin angin savoniuspada generator (single phase)mag... more Telah berhasil dibuat disain dan konstruksi turbin angin savoniuspada generator (single phase)magnet permanen NdFeB. Variasi jumlah sudu turbin masing-masing dibuat sebanyak 4, 8 dan 16 buah, dengan sumber fluida(angin) yangberasaldari turbo fan (220V/50Hz – 98W). Pada penelitian ini akan dilihat korelasi antara kecepaatan angin terhadap kecepatan putar generator, output tegangaan tanpa dan dengan beban lampu LED5W, arus listrik dan daya listrik yang dihasilkan generator tersebut. Hasil unjuk kerjagenerator (single phase)magnet permanen NdFeBterhadap pengaruh jumlah sudu turbin relatif linier, baik terhadap kecepatan putar generator, output tegangan, arus dan daya listrik. Korelasi ini menunjukkan bahwa kondisi optimum diperoleh pada kecepatan angin 6,5 m/s dan jumlah sudu turbin sebanyak 16 buah, masing-masing menghasilkan kecepatan putar generator, output tegangan tanpa dan dengan beban, arus dan daya listrik adalah 120rpm, 44,3V, 109,8V, 100mA dan 4W. Generator (single phase)magn...

Research paper thumbnail of The effect of tetraethyl orthosilicate (TEOS) additions as silica precursors on the magnetite nano-particles (Fe3O4) properties for the application of ferro-lubricant

Journal of Molecular Liquids, 2019

Abstract In this research, the effects of tetraethyl orthosilicate (TEOS) variations on the magne... more Abstract In this research, the effects of tetraethyl orthosilicate (TEOS) variations on the magnetite (Fe3O4) nano-particles were examined. The research was conducted to find the optimum TEOS additions as the silica precursors to modify the surface of the magnetite nano-particles into oleo-philic to improve the dispersion stability of the particles in the lubricant. Another purpose is to reduce the agglomerations as a result of the super-paramagnetism behaviour of the magnetite nano-particles. The TEOS additions in the mixed-solution were varied as follows: 1.2 ml and 2.5 ml. XRD analysis confirmed that the phase remains unchanged (single phase of Fe3O4). However, the coating process increases its particle size as suggested by TEM images and histogram analysis from 71 nm (uncoated) to 126 nm (silica coated). The results of the FTIR conditions suggested that a new absorption occurs at a wave number of 1058 cm−1 that indicated the stretching vibration of Si-O-Si. The magnetic properties analysis using VSM suggested that the additions of TEOS decreases the magnetic saturation value of the magnetite nano-particles. Zeta potential analysis suggested that the value is -62 mV that can be classified as a good dispersion stability colloid to be used for ferro-lubricant application.

Research paper thumbnail of The effect of magnetic nano-fluids (Fe3O4) on the heat transfer enhancement in a pipe with laminar flow

Heat and Mass Transfer, 2019

In this research, the effect of magnetic nano-fluids (Fe3O4) on the heat transfer enhancement in ... more In this research, the effect of magnetic nano-fluids (Fe3O4) on the heat transfer enhancement in a pipe with laminar flows (Re numbers of 171, 228 and 285) were examined. Different heats (15.75 and 20.6 W) were applied to an acrylic pipe to analyse the effect of magnetic nano-fluids for transferring the heat and reducing the wall temperature on a non-metal material pipe. Variations of nano-particles (volume percentage) were used in the nano-fluids solution: 2, 3 and 4%, respectively. The magnetic nano-fluids (Fe3O4) were prepared from 32.5 g of FeCl3.6H2O (ferric chloride) and 12.7 g of FeCl2.4 H2O (ferrous chloride) by using a co-precipitation method. The material characterisations using XRD and FE-SEM confirmed that Fe3O4 single phase occurred and shown that the average size diameters of the nano-particles are within a range of 20-40 nm. The experimental results suggested that the cooling capability can be enhanced by adding magnetic nano-particles controlled by permanent magnet and increasing the heat transfer in the magnetic nano-fluids system. The aggregation of the magnetic nano-particles following the magnetic field applied from the permanent magnet increases the convection heat transfer from the heating source to the nano-fluids, and thus reducing the wall temperature of the acrylic pipe.

Research paper thumbnail of Preparation of Fe3O4/Bentonite Nanocomposite from Natural Iron Sand by Co-precipitation Method for Adsorbents Materials

IOP Conference Series: Materials Science and Engineering, 2018

An adsorption method is one of the effective ways to filter the heavy metals wastes in aqueous sy... more An adsorption method is one of the effective ways to filter the heavy metals wastes in aqueous system. In this paper, the Fe 3 O 4 /bentonite nanocomposites were successfully prepared from natural iron sand by co-precipitation method. The chemical process was carried out by dissolving and hot stirring the milled iron sand and bentonite in acid solution and precipitating it by NH 4 OH. The sediment was then washed using distilled water to neutralize pH and dried at 100 °C for 5 hours to produce Fe 3 O 4 /bentonite powders. The samples were characterized by XRD, FTIR, BET, TEM, VSM and AAS. All samples were composed by Fe 3 O 4 single phase with a spinnel structure and lattice parameter of 8.373 Å. The transmittance peak of FTIR curve proved that the Fe 3 O 4 particles and bentonite had a molecular bonding. The addition of bentonite to Fe 3 O 4 nanoparticles generally reduced the magnetic properties of Fe 3 O 4 /bentonite nanocomposites. The optimum condition of 30 wt% bentonite resulted 105.9 m 2 /g in surface area, 14 nm in an average particle size and 3.2 nm in pore size. It can be used as Cu and Pb adsorbent materials.

Research paper thumbnail of Natural iron sand-based Mg1-xNixFe2O4 nanoparticles as potential adsorbents for heavy metal removal synthesized by co-precipitation method

IOP Conference Series: Earth and Environmental Science, 2019

Natural iron sand-based Mg1-xNixFe2O4 magnetic nanoparticles (x = 0.25, 0.50, 0.75) were synthesi... more Natural iron sand-based Mg1-xNixFe2O4 magnetic nanoparticles (x = 0.25, 0.50, 0.75) were synthesized using a simple co-precipitation method. The resulting nanoparticles were characterized by X-Ray Diffraction, Vibrating Sample Magnetometer, Energy Dispersive X-Ray Analysis, Atomic Absorption Spectroscopy and Scanning Electron Microscopy. The crystallite size data of the Mg1-xNixFe2O4 revealed that all samples with varied x lie under 17 nm; with x = 0.5 variation having the least crystallite size of 14.90 nm. The surface microstructure elucidation by SEM also confirmed the presence of agglomeration at x = 0.5. Optimal condition of magnetic properties was observed in Mg1-xNixFe2O4 (x = 0.75), as was displayed by the M-H curves. The adsorption capacity up to 190.5 mg/g implies that Mg1-xNixFe2O4 nanoparticles have the ability to emerge as one of the beneficial adsorbents for the removal of heavy metal ions, mainly Pb and Cu ions.

Research paper thumbnail of Heat pipes as a passive cooling system for flywheel energy storage application

Journal of Physics: Conference Series, 2019

In this research, the effects of the heat pipes arrangement as a passive cooling system in an ele... more In this research, the effects of the heat pipes arrangement as a passive cooling system in an electric motor for the flywheel energy storage application were analysed. Two heat pipes variations were used and attached to the outer surface of the electric motor, 4 and 6 heat pipes arrangements, respectively. The test was also compared with the condition where no heat pipes attached. A numerical model was developed to simulate the temperature distribution on the electric motor. An analytical model was also used to calculate the effect of the fin length to the heat transfer capability of the heat pipes. The test result suggested that the heat pipes can be used as a passive cooling system and could reduce the temperature on the surface of the electric motor significantly. The arrangement with 6 heat pipes has the highest temperature reduction from 50 to 35  C as compared to other conditions. The numerical simulation has a good agreement with the experimental results conducted in the laboratory and was used as validations for the model. The analytical model suggested that the increase of the fin length in one heat pipe affects the heat transfer surface area and thus the heat dissipation can be enhanced.

Research paper thumbnail of The effect of FeMn and FeB additive on hematite (α-Fe2O3) and their characterization

Journal of Physics: Conference Series, 2019

In this study, the mineral material addition of FeMn and FeB to the hematite (α-Fe2O3) by varying... more In this study, the mineral material addition of FeMn and FeB to the hematite (α-Fe2O3) by varying each mass concentration of 0, 4, and 8 wt.% have been prepared by powder metallurgy method. The mixing process of the powder was done by high energy milling (HEM) for 1 h. Then, the powders were calcined at temperature of 1000 ºC for 2 h. The Effect of FeMn and FeB additives on α-Fe2O3 causes the increasing of the particles diameter. The increasing of FeMn additive increases the powder density of material, but the addition of FeB decreases it. The material of α-Fe2O3with FeMn additive has dominant phases of α-Fe2O3 and the minor phases of MnO2 and Fe3O4. The material of α-Fe2O3 with FeB additive has two phases as magnetite (Fe3O4) and hematite (α-Fe2O3). The magnetic properties of a α-Fe2O3 material with FeMn and FeB additives decrease the saturation value and coercivity.

Research paper thumbnail of Effect of Calcination Temperature on Microsturctures, Magnetic Properties, and Microwave Absorption on BaFe11.6Mg0.2Al0.2O19 Synthesized From Natural Iron Sand

Case Studies in Thermal Engineering, 2019

Abstract The syntheses of BaFe11.6Mg0.2Al0.2O19 with calcination temperature variations of 900, 1... more Abstract The syntheses of BaFe11.6Mg0.2Al0.2O19 with calcination temperature variations of 900, 1050, and 1200 °C were conducted through a co-precipitation method to be used as Radar Absorbing Material. The raw materials used in the syntheses were: BaCl2, MgCl2, AlCl3 and natural iron sand from Kata Beach-Sumatera Barat, Indonesia. The material was characterized using XRD, FE-SEM, VSM, and VNA. The results confirmed that the structure of the barium hexaferrite crystal did not change due to the effect of calcination temperature. The optimum conditions properties obtained for BaFe11.6Mg0.2Al0.2O19 at a calcination temperature of 900 °C, Ms = 20.64 emu g−1, Mr = 9.89 emu g−1, Hc = 1708 Oe, and BHmax = 45800 GOe, respectively. In addition, the maximum reflection loss and the microwave absorption values obtained were − 58.60 dB and 99.99% at a frequency of 10.91 GHz.

Research paper thumbnail of Effects of Sintering Holding Time on the Structural, Electrical and Magnetic Properties of Zn0.95Ni0.05O

IOP Conference Series: Materials Science and Engineering, 2017

View the article online for updates and enhancements. Related content Effect of sintering tempera... more View the article online for updates and enhancements. Related content Effect of sintering temperature on the microstructure, electrical and magnetic properties of Zn0.98 Mn0.02O material K Sebayang, D Aryanto, S Simbolon et al.-Structural and Magnetic Properties of Codoped ZnO based Diluted Magnetic Semiconductors Li Bin-Bin, Shen Hong-Lie, Zhang Rong et al.-Structural and magnetic properties CuAl1-xCrxS2 alloys

Research paper thumbnail of Effect of Cu-Dopant on the Structural, Magnetic and Electrical Properties of ZnO

IOP Conference Series: Materials Science and Engineering, 2017

Zn 1-x Cu x O (x = 0, 2, 3, and 4 at.%) was synthesized by using solid-state reaction technique. ... more Zn 1-x Cu x O (x = 0, 2, 3, and 4 at.%) was synthesized by using solid-state reaction technique. The ZnO and CuO powders were mixed and then milled by using high-speed shaker mill. The influence of Cu dopants on the structure, magnetic, and electrical properties was investigated by using XRD, VSM, and I-V and C-V measurements. The XRD analysis showed that the Zn 1-x Cu x O had hexagonal wurtzite polycrystalline. The diffraction intensity decreased and the peak position shifted directly to a higher 2θ angle with increasing the dopant concentration. Furthermore, the lattice parameters decreased when the ZnO was doped with x = 0.04, which indicated that the crystal structure changed. The increase of Cu dopants was believed to affect the magnetic and electrical properties of ZnO.