New Structural and Electrical Data on Bi–Mo Mixed Oxides with a Structure Based on [Bi12O14]∞Columns

✍ Scribed by Rose-Noëlle Vannier; Francis Abraham; Guy Nowogrocki; Gaëtan Mairesse

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 435 KB
• Volume: 142
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1998.8034

✦ Synopsis

We recently described a new family of oxide anion conductors with a structure based on [Bi 12 O 14 ] columns (J. Solid. State Chem. 122, 394 (1996)). The parent compound of this series can be formulated as Bi 26 Mo 10 O 69 and formation of a solid solution, in the Bi 2 O 3 -MoO 3 binary system, in the range 2.574 Bi/Mo42.77 was established. The stoichiometry of this series was questioned by R. Enjalbert et al. ( J. Solid State Chem. 131, 236 (1997)), but confirmed by D. J. Buttrey et al. (Mater. Res. Bull. 32, 947 (1997)). The first part of this paper is devoted to a refutation criticisms by R. Enjalbert et al. In the second part, a comparison with other Bi 2 O 3 -based oxide anion conductors enables us to propose an iono-covalent description of this novel structure type, taking into account all the structural and electrical features, especially new neutron powder diffraction refinement and conductivity measurements under variable oxygen partial pressures.