Abstract
The structural differences between a number of mixed metal oxides containing Sb 5+, Nb 5+ and Ta 5+ ions are discussed in terms of the following three starting-points: 1. (a) the pentavalent metal ions will be as far from each other as possible due to Coulomb repulsion; 2. (b) an asymmetrical positive charge distribution around the anion favours polarization and covalency effects; 3. (c) a kind of metal ion-metal ion bond is possible between highly-charged metal ions with noble-gas configuration. Applications to several types of compounds are considered.
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