Synthesis of Yttrium Iron Garnet Powder by Homogeneous Precipitation and its Crystallization

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J. Korean Ceram. Soc. > Volume 33(6); 1996 > Article

Journal of the Korean Ceramic Society 1996;33(6): 693.

균일침전법에 의한 Yttrium Iron Garnet 분말의 합성 및 결정화

안영수, 한문희, 김종오

한국에너지기술연구소 에너지재료연구팀

Synthesis of Yttrium Iron Garnet Powder by Homogeneous Precipitation and its Crystallization

ABSTRACT

YIG precursor powder was obtained by homogeneous precipitation in chloride salt solution by thermal decom-position of urea. It was found that ferric ions precipitated prior to yttrium ions. The precipitate was minute and spherical in shape. The precipitate formed consisted of the mixture of amorphous and ferric oxyhydroxide. Crystallization of YIG was proceeded by solid state reaction of intermediate YFeO3 and Fe2O3 in the temperature range of 85$0^{circ}C$ to 140$0^{circ}C$. Single phase of YIG was obtained by heat-treatment of the powder at 140$0^{circ}C$ for 6 hrs in air. The powder calcined was molded into pellets and sintered in air. The maximum density of 4,92 g/cm3(95.1% of theoretical density) was obtainable for the pellet sintered at 145$0^{circ}C$ using the powder calcined at 90$0^{circ}C$.

Key words: Yttrium iron garnet, Synthesis, Homogeneous precipitation, Urea