Abstract
The formation of vacancies in nonstoichiometric ferrospinels and their effect, upon solid solution stability are considered. On the basis of a solution model including vacancies of both signs, the interdependency of cation and anion vacancy concentrations, and of degree of inversion and magnetite content in solutions of Mg 1− a Fe 2+ a O 4 at a fixed temperature are obtained. It is shown that vacancy concentration can be considered as a parameter determining the structure stability. Exceeding a critical value of this parameter in a given solution leads to instability. Within the temperature range considered, this critical vacancy concentration is not temperature-dependent. The estimated interdependencies are verified by X-ray, chemical and magnetic data.
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