A Simple Method for Synthesis of Strontium Ferrite Nanoparticles and their Polymeric Nanocomposites (original) (raw)
Related papers
Academic Pubilication Council of Kuwait University , 2023
In this proposed work, the strontium ferrite (SrFe 2 O 4) nanoparticles were successfully synthesized in the presence of strontium nitrate (Sr (NO 3) 2) and ferric nitrate (Fe (NO 3).9H 2 O) as primary sources by using chemical coprecipitation method. The prepared powders were kept different calcinations temperature (650, 750 and 850 C) and characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM) and vibrating sample magnetometer (VSM) techniques. The XRD patterns demonstrated the cubic and orthorhombic phase of spinel formation and FTIR transmittance spectra confirmed the presence of strontium ferrite related molecular functional groups. Further, SEM micrograph showed spherical nanoparticles with less agglomerated structure. VSM studies revealed the hard magnetic properties with the highest saturation magnetization (Ms), remanent magnetization (M r) and coercivity (H c) of 22.17 emu/g, 11.807 emu/g and 5662.6 Oe respectively by VSM.
IEEE Transactions on Magnetics, 2009
Substituted strontium ferrites SrFe 12 x Mg x 2 Sn x 2 O 19 (x = 1, 2 and 3) were prepared by sol-gel method. X-ray diffraction (XRD), transmission electron microscope (TEM), AC susceptometer, vibrating sample magnetometer (VSM) and vector network analyzer were used to analyze the structure, static and dynamic magnetic properties of the prepared samples. The prepared ferrite particles possess irregular non spherical shape with a broad size distribution. The substitution was very effective in reducing coercive field. Based on microwave measurements of reflectivity, SrFe 12 x Mg x 2 Sn x 2 O 19 is a good candidate for electromagnetic compatibility and other practical applications at high frequencies.
nano Online, 2018
Hard magnetic SrFe 12 O 19 (SrFe) nanostructures were synthesized via a facile sol-gel procedure. The effects of temperature concentration and different capping agents on the particle size and morphology of the magnetic nanoparticles were investigated. The synthesized ferrites were characterized by X-ray diffraction pattern (XRD), scanning electron microscope (SEM), and Fourier transform infrared (FT-IR) spectroscopy. The ferromagnetic property of the hexa-ferrite nanostructures was determined by alternating gradient force magnetometer (AGFM). SrFe 12 O 19 was added to the poly carbonate (PC) matrix in order to prepare the magnetic and flexible polymer matrix nanocomposite. In the nanocomposite (20%) preparation, results show that coercivity was decreased because of a 20% decrease in saturation magnetization and agglomeration in the polymer matrix.
Optical, Thermal and Magnetic Properties of Strontium Ferrite Nanoparticles
Iranian Nanotechnology Society, 2022
This study endeavors to investigate the influence of calcination temperatures (650, 750 & 850°C) on the strontium ferrite (SrFe2O4) nanoparticles synthesized by the co-precipitation method. The prepared powder samples were characterized by various measurement techniques such as X-ray diffractometer (XRD), scanning electron microscopy (SEM), thermo gravimetric analysis (TGA), and vibrating sample magnetometer (VSM). Initially, the XRD patterns were confirmed the presence of spinel SrFe2O4 phases. Overall, the number of diffraction peaks increased due to the enhancement of calcination temperature. The SEM morphological features are shown the spherical-shaped nanoparticles with less agglomeration. Considerably, the agglomeration between the nanoparticles increased due to the higher calcination temperatures. However, the structural and morphological investigation was helpful and carried out for the TGA and VSM investigation. At 850°C calcination temperature, TGA revealed 5.8% of weight loss and VSM endorsed the magnetic properties such as high saturation magnetization (Ms), remanent magnetization (Mr) and coercivity (Hc) come out to be 37.26 emu/g, 19.788 emu/g and 6188.4 Oe, respectively.
Strontium ferrite nanoparticles
Pure phase and mixed phase strontium hexa ferrite powder were prepared using citrate precursor method. The annealing temperature for both samples was 450 o C. The samples were structurally characterized using X-Ray diffractometer(XRD) and magnetically characterized using Vibrating sample magnetometer (VSM). The particle size was observed 15 nm and 8nm at same annealing temperature 450 o C. Some additional phase appears in addition to hexaferrite. The retentivity and magnetization was found 3.321 emu/g, 36.615 emu/g for pur phase sample while 0.64 emu/g and 33.332 emu/g for mixed phase sample respectively. This behaviour suggests that non-stoichiometric preparation as a possible route for engineering preparation of samples for a particular set of magnetic parameter values. In these samples we observed a change in retentivity that seemed independent of magnetization.
Structure and Magnetic Properties of SrFe12O19/CoFe2O4 Nanocomposite Ferrite
VNU Journal of Science: Mathematics - Physics
Nanocomposite particles SrFe12O19/ CoFe2O4 were synthesized by sol-gel method. The nanocomposites are formed at the calcining temperature around 850 o C in 5 hours. The phase composition, surface morphology and magnetic properties of the nanocomposites were investigated using XRD, SEM and VSM, respectively. The results show that the magnetic properties of nanocomposite particles are strongly influenced by the molar ratios of the hard and soft phases and particle size distributions. The samples with the mass ratio of Rm= SrFe12O19/ NiFe2O4 = 1/3 and 1/5 are characterized with a "bee waist" type hysteresis loop. While all the samples RV show an excellent smooth hysteresis loop and a singlephase magnetization behavior. The coercivity decreases significantly and the magnetization drastically increases with decreasing of volume ratio RV.
Nanoscale research letters, 2018
Synthesis of nanocrystalline strontium ferrite (SrFeO) via sol-gel is sensitive to its modification parameters. Therefore, in this study, an attempt of regulating the pH as a sol-gel modification parameter during preparation of SrFeO nanoparticles sintered at a low sintering temperature of 900 °C has been presented. The relationship of varying pH (pH 0 to 8) on structural, microstructures, and magnetic behaviors of SrFeO nanoparticles were characterized by X-ray diffraction (XRD), field emission scanning microscope (FESEM), and vibrating sample magnetometer (VSM). Varying the pH of precursor exhibited a strong effect on the sintered density, crystal structure and magnetic properties of the SrFeO nanoparticles. As the pH is 0, the SrFeO produced relatively largest density, saturation magnetization, M, and coercivity, H, at a low sintering temperature of 900 °C. The grain size of SrFeO is obtained in the range of 73.6 to 133.3 nm. The porosity of the sample affected the density and th...
IMPEDANCE AND MAGNETIC PROPERTIES OF STRONTIUM HEXAFERRITE NANOPARTICLES
International Journal of Trendy Research in Engineering and Technology, 2017
Magnetic nanoparticles are important physical systems, relevant for many applications, and in many cases the starting point of fundamental developments in Nanomagnetism. Strontium ferrite enjoys a high degree of chemical stability and is completely nontoxic, which makes it ideal for a wide range of applications. Magnetoplumbite-type (M-type) strontium ferrite particles have been synthesized via the sol-gel technique employing ethylene glycol as the gel precursor. The Phase, morphology and particle diameter and the magnetic properties of samples were studied by x-ray diffractometry (XRD), Scanning electron microscopy (SEM) and vibrating sample magnetometer (VSM) respectively. X-ray powder diffraction patterns showed that the samples were single-phase with the space group of P63/mmc. The magnetic properties such as coercivity, saturation magnetization and remenant magnetization of the samples were found to be 6405.2 Oe, 28.256 and 15.2 emu/g, respectively. The thermal behaviour of the nano particles was studied using thermogravimetric analysis (TGA). The impedance analysis using complex impedance spectroscopy (CIS) technique reveals negative temperature coefficient of resistance behavior of the prepared Strontium hexaferrite nano particles.
Non stoichiometric Strontium ferrite nanoparticles and magnetic measurement
Pure phase and mixed phase strontium hexa ferrite powder were prepared using citrate precursor method. The annealing temperature for both samples was 450 o C. The samples were structurally characterized using X-Ray diffractometer(XRD) and magnetically characterized using Vibrating sample magnetometer (VSM). The particle size was observed 15 nm and 8nm at same annealing temperature 450 o C. Some additional phase appears in addition to hexaferrite. The retentivity and magnetization was found 3.321 emu/g, 36.615 emu/g for pur phase sample while 0.64 emu/g and 33.332 emu/g for mixed phase sample respectively. This behaviour suggests that non-stoichiometric preparation as a possible route for engineering preparation of samples for a particular set of magnetic parameter values. In these samples we observed a change in retentivity that seemed independent of magnetization.
Strontium hexaferrite (SrFe 12 O 19) which crystallizes in the hexagonal system and has a uniaxial mag-netoplumbite structure, displays distinctive magnetic characteristics, good chemical stability, good tribological properties and a weak temperature dependent coercivity at about room temperature. In the present work the synthesis conditions for the solid-state preparation of the chromium-doped hexaferrite SrCr 0.3 Fe 11.7 O 19 were optimised and the effect on the magnetic properties of this compound of additions of nanosized SrFe 12 O 19 was studied. The nano-sized SrFe 12 O 19 additive, synthesized by the citrate–nitrate reaction, was substituted in varying amounts for a commercial calcium silicate borate sintering additive mixture. A combination of 0.75 wt% of nano-sized SrFe 12 O 19 with 0.75 wt% of the commercial additive increases the intrinsic coercivity, remanence magnetization and rectangularity ratio and results in superior magnetic properties than obtained with 1.5 wt% of nanosized SrFe 12 O 19 or the commercial sintering additive alone.