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Mossbauer 분광 분석에 의한 Ba₂(Co, Zn)₂Fe₁₂O₂₂ 내의 이온 분포 연구
최상준(S. Choi),권순주(S. J. Kwon) 한국자기학회 1996 韓國磁氣學會誌 Vol.6 No.2
Y-type hexagonal ferrites(Ba₂(Co, Zn)₂Fe₁₂O₂₂ : Me=transition metal) have promising electromagnetic properties in ㎓ range. Co and Zn are good candidates for the transition metal. To understand their role on the properties, it is thus necessary to study the ion(s) distribution in that complex Y-type hexagonal ferrite structure. The authors report Mossbauer spectroscopic results from very reliable samples, which has been extensively characterized by chemical analysis, Rietveld analysis of X-ray diffraction patterns, and magnetic property measurements. Analyzing two samples, Co₂Y and Co_(1.6)Zn_(0.4)Y, conclusions are made as follow : (1) Co ions prefer the tetrahedral interstitial sites in the S-block (6c_Ⅳ) and the octahedral sites (18h_Ⅵ) at the interface of S- and T-block. (2) Partial substitution of Co with Zn (within the experimental range) does not disturb the Fe distribution.
Co - Zn 복합 y-형 육방정 페라이트의 자기적 특성
이종협(J. H. Lee),권순주(S. J. Kwon) 한국자기학회 1994 韓國磁氣學會誌 Vol.4 No.2
A Ba₂Co_(2-x)Zn_xFe₁₂O₂₂(x = 0.0 ~ 2.0, Co_(2-x) Y) powder was prepared by a oxidation-coprecipitation method and sintered at 1150 ~ 1250℃ for 4 hours. The microstructures and magnetic properties(saturation magnetization, Curie temperature), complex permeability of sintered body were measured As increasing Zn content from x = 0 to 2.0 in Co_(2-x)Zn_x Y, the real value of complex permeased from 7㎓ to 1㎓. Because of resonance in few ㎓ range, Y-type hexagonal ferrite is more applicalble than spinel ferrite in high frequency range, and more research would be necessary to find the mechanism of the second resonance observed in higher frequency.