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J. Korean Ceram. Soc. > Volume 42(10); 2005 > Article
Journal of the Korean Ceramic Society 2005;42(10): 672.
doi: https://doi.org/10.4191/kcers.2005.42.10.672
염을 이용한 Sr 페라이트의 분말합성과 그의 자성특성
김정식, 김시동
서울시립대학교 신소재공학과
Synthesis of Sr-Ferrite by a Molten Salt Flux and Its Magnetic Properties
Jung-Sik Kim, Si-Dong Kim
Department of Materials Science and Engineering, The Univerity of Seoul
ABSTRACT
In this study we prepared the Sr-ferrite powders and magnet by a molten salt method using the (NaCl+KCl) salt mixture. Starting materials of $Fe_{2}$$O_{3}$ and Sr$Co_{3}$ were mixed as the molar ratio of 5.70:1, and 0.08 mol$ % $ $Al_{2}$$O_{3}$, 0.10 mo1$ % $ Si$O_{2}$ and 0.12 mo1$ % $ CaO were added as additives. Sr-ferrite powders synthesized at the reaction temperatures of 800$∼$1200$ ^{circ}C $ showed the typical M-type hexagonal ferrite phase, and hexagonal plate-like morphology with uniform distribution of 1$∼$3 $mu$m particle size. The bulk density of the sintered Sr-ferrite magnet prepared with powders by the molten salt method showed the maximum density of 4.82 g/$cm^{3}$ at the sintering temperature of 1200$^{circ}C $. The maxima of remanent flux density (Br, 45 emu/g) and coercive force (iHc, 3.75 kOe) occurred at the sintering temperatures of 1150$ ^{circ}C$ and 1200$^{circ}C $.
Key words: Ferrite, Permanent magnet, Magnetic properties, Ceramic processing
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