Methods of Preparation and Crystal Chemistry of Ferrites

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Abstract
Conventional ceramic methods for pure oxide materials can generally be applied to the processing of ferrites. Specialized techniques such as coprecipitation and hydrostatic pressing are sometimes employed. A process involving nonaqueous milling and forming additives provides dense shapes. The general formula for ferrites is MO·Fe2O3 (M is a divalent metallic cation). X-ray diffraction may be used to conduct unit cell and phase relation studies. Metallurgical micrographic techniques are useful in investigating grain and pore structure. A study of the solid state reaction kinetics of an equimolar mixture of MgO and Fe2O3 at elevated temperatures showed that the reaction was expressed by the diffusion equation (1- 3√1-.01x)2 = K where x is the percentage of reaction at time t, and Kis a constant.