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J. Korean Ceram. Soc. > Volume 49(3); 2012 > Article
Journal of the Korean Ceramic Society 2012;49(3): 205.
doi: https://doi.org/10.4191/kcers.2012.49.3.205
육방정 페라이트의 결정과 Block 구조
가야대학교 안경광학과
Crystal and Block Structures of Hexagonal Ferrites
Hyung-Sup Shin
Department of Ophthalmic Optics, Kaya University
It has been studied the crystal and block structures of the hexagonal ferrites with M, W, Y and Z types prepared by various coprecipitation-oxidation method. The structures have been refined with a Rietveld analysis of the powder X-ray diffraction pattern with high precision ($R_{WP}$ <0.09, $R_I$ <0.03). The density difference between the S-blocks was proportioned to the cobalt contents in hexagonal ferrites, but that between the R or T-blocks was relatively small. Compared with the blocks and cation-oxygen polyhedra in BaM ($BaFe_{12}O_{19}$), those were bulky to the normal direction for the c-axis in $Co_2W$ ($BaCo_2Fe_{16}O_{27}$) and to the parallel direction for the c-axis in $Co_2Y$ ($Ba_2Co_2Fe_{12}O_{22}$) and $Co_2Z$ ($Ba_3Co_2Fe_{24}O_{41}$). The S-blocks of $Co_2W$, $Co_2Y$, and $Co_2Z$ were unstable and distorted. Because the T-block of $Co_2Z$ was unstable, the T-block was decomposed into the Ba-rich phase and $Co_2W$ at high temperatures above $1200^{circ}C$. A standard powder X-ray diffraction pattern for $Co_2Z$ was proposed as well.
Key words: Hexagonal ferrite, Rietveld analysis, Crystal structure, Block structure
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