한국세라믹학회지 (Journal of the Korean Ceramic Society)

  • 제49권3호
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  • Pages.205-215
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  • 2012
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  • 1229-7801(pISSN)
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  • 2234-0491(eISSN)
한국세라믹학회 (The Korean Ceramic Society)
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육방정 페라이트의 결정과 Block 구조

Crystal and Block Structures of Hexagonal Ferrites

  • 투고 : 2012.02.19
  • 심사 : 2012.04.30
  • 발행 : 2012.05.31
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초록

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.

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참고문헌

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피인용 문헌

  1. Mössbauer Studies Magnetic Properties of BaCo2−xZnxFe16O27 vol.51, pp.11, 2015, https://doi.org/10.1109/TMAG.2015.2431746