水熱合成したマンガン亜鉛フェライトの粉末特性と焼結性

概要

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Ultrafine Mn-Zn ferrite powders were synthesized under mild hydrothermal conditions by precipitation from metal nitrates with an aqueous ammonia. R value (alkalinity) was introduced to adjust the amount of added ammonia. A method of controlling the desired compositions and crystallite sizes of synthesized powders was proposed in this paper. In addition, the effect of R value and hydrothermal time on powder characterization, such as the Mn/Zn ratio in spinel structure of synthesized powders, variation of X-ray diffraction angle of spinel ferrites, crystallite size and the loss ratio of Zn^<2+> for different starting suspensions during hydrothermal process, was also investigated. Powders upon hydrothermal treatment exhibited superior sinterability as compared to powders which were not subjected to hydrothermal treatment. High densities, 99.4-99.8% of theoretical densities, were obtained upon sintering green ferrite powders at relatively low temperature (900-950℃) in N_2 atmosphere without any sintering aids.
社団法人日本セラミックス協会の論文
2000-01-01