湿式Ni-Znフェライトの生成および加熱変化

概要

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Formation of Ni-Zn ferrite by wet method, and the change of magnetic characteristics arised from heating of the coprecipitates were examiried.<BR>The coprecipitates were prepared by adding alkaline solution into the constituent metal ions solution, and then aged at various temperature. Below 120°C, the products were ultra-fine spherical particles of about 90A in diameter. Above 120°C, some of them grew into cubic particles. The products formed in the latter condition were constructed of superparamagnetic and ferromagnetic particles. When those were heated at 800°C in air, the superparamagnetic particles disappeared. The Curie temperature of Ni-Zn ferrite obtained by this method were higher than that by ceramic method. When the coprecipitates were heated at 1000°C, the Curie temperature of it was the same value as that by ceramic method.