Effect of Cu2+ Doping on Structural and Optical Properties of Synthetic Zn0.5CuxMg0.5-xFe2O4 (x = 0.0, 0.1, 0.2, 0.3, 0.4) Nano-Ferrites (original) (raw)
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Advances in Nanoparticles
The Zn 0.5 Cu x Mg 0.5−x Fe 2 O 4 (where x = 0.0, 0.1, 0.2, 0.3 and 0.4) was prepared by sol-gel route and characterized in detail in terms of their structural, morphological, elemental and optical properties as a function of Cu concentration. X-ray diffractometer (XRD) results confirmed the formation of cubic spinel-type structure with average crystallized size in the range of 30.56 to 40.58 nm. Lattice parameter was found to decrease with Cu concentration due to the smaller ionic radius of Cu 2+ ion. The HR-SEM images show morphology of the samples as prismatic shaped particles in agglomeration. The elemental dispersive X-ray Spectroscopy (EDX) confirmed the elemental composition of the as-prepared spinel ferrite material with respect to the initial concentration of the synthetic composition used for the material. The Fourier transform infrared (FTIR) spectroscopy confirmed the formation of spinel ferrite and showed the characteristics absorption bands around 463, 618, 876, 1116, 1442, 1622 and 2911 cm −1. The energy band gap was calculated for the samples were found to be in the range of 4.87 to 5.30 eV.
Advances in Nanoparticles
The samples of Zn 0.5 Cu x Mg 0.5-x Fe 2 O 4 nanoparticle ferrites, with x= 0.0, 0.1, 0.2, 0.3, 0.4 were successfully synthesised. Structural and optical properties were investigated by X-ray Diffraction (XRD), Fourier Transform Infrared spectroscopy (FTIR) and UV-visible spectroscopy. The structural studies showed that all the samples prepared through the Co-precipitation method was a single phase of a face-cantered-Cubic (FCC) spinel symmetry structures with space group (SG): Fd-3m. In the series Zn 0.5 Cu x Mg 0.5-x Fe 2 O 4 , the lattice parameter was found to be 8.382 Å for x = 0 and was found to increase with copper concentration. The grain size obtained from the XRD data analyses was found to be in the range of 15.97 to 28.33 nm. The increased in the grain size may be due to the large ionic radius of Mg 2+ (0.86 Å) compared with Cu 2+ (0.73 Å). The FTIR spectroscopy confirmed the formation of spinel ferrite and showed the characteristics absorption bands around 580, 1112, 1382, 1682, 1632 and 2920 cm −1. The energy band gap was calculated for samples were found to be in the range 4.04 to 4.67 eV.
PHYSICA B
A series of copper (Cu 2þ) doped Zn 0.4 Co 0.6-x Ce 0.1 Fe 1.9 O 4 (x ¼ 0.0, 0.15, 0.30, 0.45, 0.60) nanoparticles were synthesized via co-precipitation route in order to evaluate different properties like the structural, optical, electrical and magnetic through XRD, UV-VIS, SMU with two probes and VSM methods. The XRD patterns confirmed the formation of cubic spinel structure of the prepared samples. Replacement of Co 2þ ions with Cu 2þ ions have been confirmed by X-ray diffraction patterns. FTIR and UV-Vis also confirmed this replacement. The electrical parameters like DC resistivity, activation energy, and drift mobility have been evaluated to confirm the semiconductor nature of the spinel ferrites. The Curie temperature declines on replacement of Cu 2þ ions with Co 2þ. The magnetic parameters like Bohr magnetic moment, anisotropy constant, initial permeability, Y-K angles, coercivity, and remanence ratio have been measured and determined. The saturation magnetization (Ms) and remanence (Mr) show remarkable decreasing trend with Cu 2þ ions concentration.
Ceramics International , 2021
An intensive research has been begun on spinel nano-ferrites owing to their unique and novel size dependent chemical and physical properties. Indium doped cobalt-zinc spinel nano-ferrites, Co 0.9 Zn 0.1 In x Fe 2-x O 4 (x = 0.05, 0.1, 0.15, 0.2, 0.25, 0.3), have been fabricated through solution-combustion (SC) method and characterized for structural, morphological and temperature dependent electric and dielectric behavior. XRD affirmed that all spinel nano-ferrites have single phase. The TEM and EDX micrographs have confirmed morphology and composition of the samples, respectively. The crystallite size has decreased from 23.8 nm to 20.2 nm, while the lattice constant has been seen to enhance from 8.385 Å to 8.426 Å with the replacement of Fe 3+ ions by In 3+ ions. FTIR spectroscopy has been performed to extract the information about the stretching of metal-oxygen bonds as well presence of various functional groups. Moreover, FTIR has confirmed that there is no deviation in the structure of the Co-Zn spinel nano-ferrites with the addition of In 3+ ions. Additionally, there is no significant deviation in the peak positions of respective peaks has been observed except, when composition changes from x = 0.05 to x = 0.10 for peak I and peak II. The resistivity has been observed to decrease with the rise in temperature, which has confirmed the semiconductor character of the prepared spinel nano-ferrites. An enhancement in resistivity has been viewed with the rise in In 3+ ions, while a normal dispersion curve has been observed for the variation of the dielectric constant as a function of frequency. Spinel nano-ferrites show a decrease in the dielectric constant with the increase in frequency as well as indium ion content. The dielectric loss tangent shows minute values suggest the utility of the present spinel nano-ferrites for microwave frequency applications.
Impact of chemical composition on preparation of nanodimensional spinel ferrites
2015
The nanostructured manganese and zinc ferrite-type materials were synthesized using preparation methods such as co-precipitation or co-precipitation and mechanochemical treatment. The physicochemical techniques – Powder X-ray diffraction analysis (PXRD), Mossbauer and Fourier transform infrared (FTIR) spectroscopy were performed in order to establish the phase composition, structure and magnetic behavior of prepared nanodimensional ferrite-type samples. The PXRD results determined that single non-stoichiometric ferrite phase (ZnxFe3–xO4, x=0.25) as well as ferrite (ZnxFe3–xO4, x=0.5;1, MnxFe3–xO4, x=0.25;0.5;1) and additional akaganeite phases were obtained by co-precipitation procedure. The presence of ferrite and iron phases and elimination of akaganeite was achieved using high-energy ball milling. The synthesized nanosized manganese and zinc ferrite-type materials possess the mean crystallite size about 7–13 nm and 6–13 nm respectively. The superparamagnetic (SPM) and collective ...
In this work, cobalt (Co) substituted magnesium Zinc nanocrystalline spinel ferrites having general formula Zn 0.5 Co x Mg 0.5 -xFe 2 O 4 (with x=0.1, 0.2, 0.3, 0.4, 0.5) were synthesized using chemical co-precipitation method. The Cobalt substituted magnesium was annealed at 450°Cand characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and UV-visible spectroscopy. XRD analysis confirmed the formation of single phase spinel structure. The crystalline size was calculated using Scherer's formula and wasfound to be in 21.44 -25.03 nm range. The lattice constant was found to decreases as substitution of Co is further increased. The decrease in lattice constant may attribute to the smallerionic radius of Co as compared to Zinc ion. The FTIR spectra for the samples measured in the range of 4000-400 cm -1 exhibited symmetric stretching mode of vibration of tetrahedral and octahedral sites. The energy band gaps of the materials were calculated and were found to be in the range of 4.5 to 4.8eV.
Advances in Nanoparticles, 2015
In this work, the Mg1-xZnxFe2O4 Nanoferrites (where x = 0.0, 0.2, 0.4, 0.6 and 0.8) was synthesized using co-precipitation method. The investigation of structural and optical properties was carried out for the synthesized samples using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and Ultraviolet visible spectrophotometer (UV-Vis). XRD revealed that the structure of these nanoparticles is spinel with space group Fd3m and crystallite size lies in the range 21.0 -42.8 nm. Lattice parameter was found to increases with Zn concentration and this may be due to the larger ionic radius of the Zn 2+ ion. FTIR spectroscopy confirmed the formation of spinel ferrite and showed the characteristics absorption bands around 612, 1146, 1404, 1649 and 3245 cm −1 . The energy band gap was calculated for samples with different ratio and was found to be 4.77, 4.82, 4.86, 4.87 and 4.95 eV. The substitution was resulted in slight increased in the lattice constant and that sequentially may lead to the slightly decreased in the energy gap.
A comprehensive study on structure, properties, synthesis and characterization of ferrites
AIMS Materials Science
The research on ferrites is fast moving owing to their exponentially growing usage in magnetic shielding, magnetic biosensors, magnetic recording devices, information storage, mobile communication, electronic devices, gyromagnetic device, medical devices, transformers, pollution control, catalysis, and pigments. This review comprises the present state of the art on hexagonal ferrites (HFs) and spinel ferrites (SFs). The article covers the background, properties, classification schemes, synthesis and characterization of ferrites. It focuses on a comparative understanding of four synthesis routes, magnetic properties and characterization of the ferrites. The article emphases X-ray diffraction, scanning electron microscopy, transmission electron microscopy, vibrating sample magnetometer, spectroscopy, thermal analysis and vector network analyser results. The present work is meant for the faster understanding of this research area.
Structural and Electrical Properties of Nano [Ni 0.6 Zn 0.4 Fe2 O4] Spinel Ferrite
International Journal of Scientific Research in Science and Technology, 2021
Nano Ni-Zn ferrite with composition Ni 0.6 Zn 0.4 Fe2O4 is prepared by using sol-gel auto-combustion method with citric acid as a fuel. The structural properties of synthesized nano-ferrite is characterized by powder X-ray diffraction (XRD) technique while the electrical properties have been studied using two probe method. The X-ray diffraction study confirms that, there is a formation of single-phase cubic spinel with most intense peak at [311] having lattice constant of 8.3585 A0 and the average particle size is found to be 45.63 nm. In addition to this, the electrical resistivity of Ni-Zn Ferrite decreases with increase in temperature which exhibits semiconductor nature.