Abstract
Most of the mixed magnetic oxides, with the exception of garnets, can be derived from the sublattice formed by close packed oxygen anions into which cations of the suitable size, valency and electron configuration are introduced. Their formation is driven by two fundamental conditions, condition of the electroneutrality and condition of the Gibbs energy minimum. General problems of the crystal chemistry of the mixed magnetic oxides are discussed from this point of view in the first part of the article. The second part is concentrated on spinels, influence of various cations on their properties, namely the distribution of cations between the tetrahedral and octahedral position, macroscopic Jahn-Teller distortion, formation of clusters and ordering of cations. Destabilization of the spinel structure due to the deviations from the ideal stoichiometry and the influence of the cation properties is discussed in the last part.
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