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Powar, Rohit R.,Phadtare, Varsha D.,Parale, Vinayak G.,Pathak, Sachin,Piste, Pravina B.,Zambare, Dnyandevo N. The Korean Ceramic Society 2019 한국세라믹학회지 Vol.56 No.5
Chromium-doped zinc ferrite nanoparticles with the general formula Cr<sub>y</sub>ZnFe<sub>2-y</sub>O<sub>4</sub> (y = 0, 0.025, 0.05, 0.075, and 0.1) were synthesized by a surfactant-assisted chemical co-precipitation route using metal nitrate salt precursors. The phase purity and structural parameters were determined by powder X-ray diffraction. The concentration of Cr<sup>3+</sup> doped into ZnFe<sub>2</sub>O<sub>4</sub> (ZF) noticeably affected the crystallite size, which was in the range of 22 nm to 36 nm, and all samples showed a single cubic spinel structure without any secondary phase or impurities. The lattice parameter, X-ray density, and skeletal density increased with an increase in the Cr-doping concentration; on the other hand, a decreasing trend was observed for the particle size and porosity. The influence of Cr<sup>3+</sup> substitution on ZF magnetic properties were studied under an applied field of 15 kOe. The overall results revealed that the incorporation of a small amount of Cr dopant changed the structural, electrical, and magnetic properties of ZF.
Rohit R. Powar,Varsha D. Phadtare,Vinayak G. Parale,Sachin Pathak,Pravina B. Piste,Dnyandevo N. Zambare 한국세라믹학회 2019 한국세라믹학회지 Vol.56 No.5
Chromium-doped zinc ferrite nanoparticles with the general formula CryZnFe2-yO4 (y = 0, 0.025, 0.05, 0.075, and 0.1) were synthesized by a surfactant-assisted chemical co-precipitation route using metal nitrate salt precursors. The phase purity and structural parameters were determined by powder X-ray diffraction. The concentration of Cr3+ doped into ZnFe2O4 (ZF) noticeably affected the crystallite size, which was in the range of 22 nm to 36 nm, and all samples showed a single cubic spinel structure without any secondary phase or impurities. The lattice parameter, X-ray density, and skeletal density increased with an increase in the Cr-doping concentration; on the other hand, a decreasing trend was observed for the particle size and porosity. The influence of Cr3+ substitution on ZF magnetic properties were studied under an applied field of 15 kOe. The overall results revealed that the incorporation of a small amount of Cr dopant changed the structural, electrical, and magnetic properties of ZF.
Powar, Rohit R.,Phadtare, Varsha D.,Parale, Vinayak G.,Park, Hyung-Ho,Pathak, Sachin,Kamble, Pravin R.,Piste, Pravina B.,Zambare, Dnyanashwar N. Elsevier 2018 Ceramics international Vol.44 No.17
<P><B>Abstract</B></P> <P>In the present study, the chemical co-precipitation technique was adopted to synthesize Zn<SUB>x</SUB>Co<SUB>1-x</SUB>Fe<SUB>2</SUB>O<SUB>4</SUB> (ZCF) (0 ≤ x ≤ 1) ferrites. The thermogravimetric-differential thermal analysis results revealed that above 405 °C, the precursor had decomposed and ferrite formation had occurred. The structure and morphology of the prepared ferrite nanoparticles were investigated using X-ray diffraction, Fourier transform infrared spectroscopy, and field emission scanning electron microscopy (FE-SEM). The synthesized polycrystalline nanoparticles had a cubic spinel structure and the crystallite size was in the range of 6.09–12.98 nm. The prepared ferrites appeared as nearly spherical nanoparticles with a particle size in between 0.13 and 0.23 µm, as confirmed using FE-SEM. The elemental composition was determined using the energy-dispersive X-ray spectroscopy technique. The influence of the Zn-substituted cobalt ferrites (ZCF) on the structural, morphological, and magnetic properties were studied. The magnetic properties of the ZCF samples such as saturation magnetization, remanence magnetization, and coercivity measured at room temperature were 0.387–2.065 emu/g, 0.057–1.282 emu/g, and 60–1834 Oe, respectively. It was confirmed from the nature of the hysteresis loops that the given ZCF samples can be considered as a soft magnetic material.</P>