酢酸バリウムと鉄アセチルアセトナートの加水分解によるバリウムヘキサフェライトの合成(<小特集>粉体小特集)

概要

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Highly pure barium hexaferrite with a homogeneous composition was synthesized by hydrolysis of barium acetate and tris(acetylacetonate)iron (III) under controlled hydrolyzing conditions and bye the subsequent heat-treatment. In order to prepare an amorphous coprecipitate with desired composition by this method,the pH value of the solution,the refluxing temperature and the amount of hydrolyzing water have to be controlled. The amorphous coprecipitate of barium hexaferrite thus prepared crystallized by heattreatment above 800℃ for more than 1 hr, without forming any intermediate compound. The particle size and the size distribution increase with increasing heat-treatment temperature. By heating the amorphous fine powder,the grain grew form 200 Å at 700℃ to submicrometer size above 800℃. The size distribution became wider after heat-treatment above 800℃, and thus the direct relationship between particle size and specific surface diameter could not be observed. With single domain size range with excellent magnetic properties.
社団法人日本材料学会の論文
1986-11-15