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Mossbauer 분광법에 의한 Co₁+xFe₂-₂xTixO₄ 페라이트 분말의 연구
채광표(Kwang Pyo Chae),정성근(Sung Keun Chung),김원기(Won Ki Kim),이성호(Sung Ho Lee),이영배(Young Bae Lee) 한국자기학회 2000 韓國磁氣學會誌 Vol.10 No.5
Ultra-fine Co_(1+x)Fe_(2-2x)Ti_xO₄ ferrite powders have been prepared by the sol-gel method. The crystallographic and magnetic properties of the sample have been investigated by means of x-ray diffraction, Mossbauer spetroscopy and vibrating sample magnetometry. The formation of nano crystallized particles is confirmed. The x-ray diffractions of all samples with various compositions clearly indicate the presence of spinel structure. The Mossbauer spectra could be fitted as the superposition of two sextets due to Fe³+ at A-site and B-site. The is and QS values nearly constant with substituted Co-Ti contents, whereas Hhf of B-site decreases with increasing Co-Ti substitution in Co_(1+x)Fe_(2-2x)Ti_xO₄. The magnetic behaviour of powders shows that the saturation magnetization and the coercivity decrease with increasing x in Co_(1+x)Fe_(2-2x)Ti_xO₄.