Mossbauer 분광법에 CoCrxFe₂-xO₄의 연구

다국어 초록 (Multilingual Abstract)

The CoCr_xFe_(2-x)O₄(0.0≤x≤1.0) ferrites have been fabricated by sol-gel method. The crystallographic and magnetic properties of the samples were investigated by means of x-ray diffraction, scanning electron microscophy, Mossbauer spectroscopy and vibrating sample magnetometry. The structure of all the samples is cubic spinel type and the lattice constant decrease with increasing Cr content. The substituted Cr ions were located only in the B-site. The particle size also decreases with increasing Cr content. The Mossbauer spectra consist of two sextets due to Fe³+ ions at A- and B sites for 0.0≤x≤0.6, while, a paramagnetic doublet appears for 0.8≤x≤1.0. The magnetic hyperfine field decreases with increasing Cr content. The relaxation spectra was shown at 0.8≤x≤1.0 in CoCr_xFe_(2-x)O₄. The coercivity decreases drastically, while, the saturation magnetization decreases linearly with increasing x.