Formation of Fine Ni- and Co-Ferrites Powders by Vapor Phase Reaction

Abstract

The vapor phase reactions of FeCl₂-NiCl₂-O₂ system and FeCl₂-CoCl₂-O₂ system at 700-1000°C were found to produce the fine powders of Ni-and Co-ferrites, respectively. The ferrite particles were single-crystalline and finer than 1μ, having the mean sizes of 0.16-0.5μ (Ni-ferrite) and 0.15-0.25μ (Co-ferrite).