Preparation and Characterization of Pure-Phase Co^sub 2^Y Ferrite Powders via a Scalable Aqueous Coprecipitation Method

Aqueous chemical coprecipitation methods have been developed to produce large quantities, 12 g per batch, of pure-phase ...-type hexaferrite powders. X-ray diffraction studies showed that sintering temperatures as low as 900...C were sufficient to produce a single-phase Y-type hexaferrite material. The method has also been shown to lend itself to efficient scale up, leading to large batch production. The growth of particles as a function of time and temperature in a single-step sintering process, as opposed to multiple annealing and sintering processes required in conventional ceramic processing, was explored. Size and shape of particles have been characterized by scanning electron microscopy, while the magnetic properties were studied by vibrating sample magnetometry. Measured structural and magnetic properties are closely matched with those of bulk ceramic materials, indicating that the proposed approach may serve as a large-scale, cost-effective substitute to conventional ceramic processing of hexagonal ferrite materials. (ProQuest: ... denotes formulae/symbols omitted.)