Magnetic and structural properties of ultrafine Ni-Zn-Cu ferrite grown by a sol-gel method

被引:40
作者
Kim, WC
Park, SI
Kim, SJ
Lee, SW
Kim, CS [1 ]
机构
[1] Kookmin Univ, Dept Phys, Seoul 136702, South Korea
[2] Chungbuk Natl Univ, Sch Elect & Elect Engn, Cheongju 361763, South Korea
关键词
D O I
10.1063/1.372667
中图分类号
O59 [应用物理学];
学科分类号
摘要
Ultrafine Ni0.65Zn0.35Cu0.2Fe1.8O4 particles were fabricated by a sol-gel method. The magnetic and structural properties of the powders were investigated with x-ray diffraction, vibrating sample magnetometer, and Mossbauer spectroscopy. Ni-Zn-Cu ferrite powders that were fired at and above 823 K have only a single phase spinel structure and behave ferrimagnetically. Powders annealed at 523, 623, and 723 K have a typical spinel structure and are simultaneously paramagnetic and ferrimagnetic in nature. The magnetic behavior of Ni-Zn-Cu ferrite powders fired at and above 623 K showed that an increase of the annealing temperature yielded a decrease of the coercivity and an increase of the saturation magnetization. The maximum coercivity and the saturation magnetization of Ni-Zn-Cu ferrite powders were H-c=96 Oe and M-s=68 emu/g. Mossbauer spectra of powder annealed at 1223 K were taken at various temperatures ranging from 12 to 675 K. As the temperature increased toward T-N, a systematic line broadening effect in the Mossbauer spectra was observed and was interpreted as originating from the different temperature dependencies of the magnetic hyperfine fields at various iron sites. The isomer shifts indicated that the iron ions were ferric at the tetrahedral [A] and the octahedral site [B]. The Neel temperature was determined to be T-N=675 +/- 2 K. (C) 2000 American Institute of Physics. [S0021-8979(00)40908-4].
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页码:6241 / 6243
页数:3
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