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RISS 인기검색어
- 검색키워드
- 저자 : T. Anjaneyulu (검색결과 3 건)
- 무료
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T. Anjaneyulu,A. T. Raghavender,K. Vijaya Kumar,P. Narayana Murthy,K. Narendra 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.8
Nanocrystalline Ni1−xZnxFe2O4 ( 0.0 ≤ x ≤ 0.8) ferrites have been synthesized by using an oxalic-acid-based precursor method. The X-ray diffraction (XRD) analysis revealed the formation of a single-phase spinel structure at very low annealing temperature. The particle size was observed to decrease with increasing Zn content x. The lattice constants was observed to increase with increasing Zn content x due to large ionic radii of the zinc ion when compared to that of the nickel ion. Magnetic measurements at room temperature revealed that the magnetization did not change monotonically with increasing Zn content x. The coercivity and the remanence were observed to decrease with increasing non-magnetic Zn content x. The observed magnetic properties may be due to a reduction in the number of exchange interactions and the nanocrystalline size with increasing Zn content x.
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Effect of Gd Doping on the Structural and Magnetic Properties of Ni-Cu-Zn-Fe$_2$O$_4$
P. Venkata Srinivasa Rao,T. Anjaneyulu,M. Rami Reddy 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.75 No.4
Ni$_{0.5}$Cu$_{0.25}$Zn$_{0.25}$Gd$_x$Fe$_{2-x}$O$_4$ ($x$ = 0.0, 0.025, 0.05, 0.075, 0.1) ferrites were synthesized using an oxalic-based precursor method. A single phase Ni-Cu-Zn-Gd ferrite was observed from X-ray diffraction (XRD) data except for higher Gd content. For $x$ = 0.1, a secondary phase due GdFe$_2$O$_3$ was observed. The particle size was observed to decrease and the lattice constant to increase with increasing Gd doping concentration. The IR spectra confirmed the existence of bands corresponding to spinel ferrites. The IR band positions were observed to shift towards higher positions with increasing Gd doping concentration. The saturation magnetization, coercivity and remanence magnetization were observed to increase as a result of Gd doping. The substitution of Gd ions in the place of Fe ions resulted in changes in the structural and magnetic properties due to replacement of smaller ionic radii Fe ions by larger ionic radii Gd ions.
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Annealing Temperature Dependent Structural and Magnetic Properties of Ni-Cu-Zn Nanoferrites
P. Venkata Srinivasa Rao,T. Anjaneyulu,M. Rami Reddy 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.72 No.5
The effect of annealing temperature on the structural and the magnetic properties of Ni0.5Cu0.25Zn0.25Fe2O4 (Ni−Cu−Zn) nanoferrites synthesized using an oxalic-based precursor method was investigated in detail. A single phase of the Ni−Cu−Zn ferrite was observed from X-ray diffraction (XRD) data. From the XRD analysis, the grain size was found to increase with increasing annealing temperature from 500 to 800 °C whereas the lattice constant was found to decrease. The scanning electron microscope (SEM) analysis showed nanosize grains in the prepared samples. The magnetization analysis showed that the saturation magnetization (Ms) increased with increasing annealing temperature due to the increasing grain size whereas the coercivity (Hc) and the remanence magnetization (Mr) showed decreasing behaviors. The Curie temperature (TC) was measured for all samples. As the grain size increased the Curie temperature was also observed to increase. For these samples, the Curie temperatures lies between 426 K to 504 K. The dielectric constant (ε') was observed to be higher for these samples. The dielectric loss tangent increase slowly with increasing frequency till a particular frequency, after that it slowly decreased. Therefore the annealing temperature was observed to have a significant effect on the structural, magnetic and electrical properties of synthesized Ni−Cu−Zn ferrite.
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