Novel solid solution precursor method for the preparation of ultrafine Ni-Zn ferrites

Ultrafine Ni-Zn ferrites, Ni _x Zn_1-x Fe₂0₄, have been prepared by the thermal decomposition/combustion of novel solid solution precursors of the type, (N₂H₅)₃N_1-x Zn_1-x Fe₂(N₂H₃C00)₉ · 3H₂0 wherex = 0.2 to 0.8. The novelty of the precursors being their low temperature, exothermic, gas producing self-sustained decomposition. Fine particle nature of the ferrites has been indicated by X-ray powder diffraction, transmission electron microscopy and surface area measurements. Fine particle Ni-Zn ferrites sinter at 1000° C, 24 h to achieve almost 99% theoretical density.