High-Temperature Studies of the Structure of Complex Oxides Based on Bi26Mo10O69–d

Abstract

Complex oxides with the general formula Bi_26–2xMe_2x^′ Mo₁₀O_69–d, Bi₂₆Mo_10–2yMe_2y^′′ O_69–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.