Grain Growth in Nickel Ferrites

Abstract
A discussion of continuous and discontinuous grain growth in nickel ferrites is presented. Experimental evidence indicates that the presence of polyphase material is favored by excess nickel oxide and that discontinuous grain growth can be accounted for by excess iron oxide. Quantitative measurements of isothermal grain‐growth rates in stoichiometric nickel ferrite yielded an energy of activation of 90 kcal. per mole for the process.

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