High-Temperature Studies of the Structure of Complex Oxides Based on Bi26Mo10O69–d
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Complex oxides with the general formula Bi26–2xMe2x′ Mo10O69–d, Bi26Mo10–2yMe2y′′ O69–d are synthesized by the standard ceramic technology, certified and analyzed by high-temperature X-ray and neutron diffraction techniques. Specific features of the structures of triclinic and monoclinic modifications of complex oxides are determined. It helps interpret a change in the electroconductive properties of the samples as a result of a polymorphic transition: in the monoclinic modification [MoO4–O–MoO4] clusters are detected together with a doubled amount of [(MoO4)–Bi(MoO4)–]n chains oriented along the b axis, which may affect the character of oxygen ion transfer. For Fe-substituted samples selective iron substitution for molybdenum is revealed.
Keywordsbismuth molybdates bismuth oxide oxygen ion conductors high-temperature X-ray diffraction high-temperature neutron diffraction
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