FeNb11O29(m), FeNb11O29(o) and two mixed oxides with the composition limits FeNb29O74 and TiNb14O37 were prepared by chemical transport. The crystal structures of the compounds have been examined by two-dimensional high resolution electron-microscopy. They are composed of ‘blocks’ of (n × 3) corner shared octahedra and belong to a series of structure related compounds with the general formula Me3nO8n-3. Crystallographic defects and the thermic behavior of the materials are discussed.
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Brunner et al. (1976) studied this question.
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