Abstract
Formation of Ni-Zn ferrite by wet method, and the change of magnetic characteristics arised from heating of the coprecipitates were examiried.
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.
