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Bi–La-Based Oxide Conductors with Rhombohedral Bi–Sr–O Type: Structural and Conductivity Properties Optimization by Polycationic Substitutions for La

✍ Scribed by M. Drache; J.P. Wignacourt; P. Conflant

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
162 KB
Volume
149
Category
Article
ISSN
0022-4596

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✦ Synopsis

In Bi 0.775 La 0.225 O 1.5 , the best oxide conductor of the hexagonallayered materials family known as the Bi+Sr+O type, partial polycationic substitutions for La 3؉ , such as (Ce 4؉ ؉M 2؉ II ) for 2 La 3؉ (M II ‫؍‬ Ba, Pb) or (M 6؉ VI ؉3M 2؉ II ) for 4 La 3؉ (M VI ‫؍‬ Mo, W; M II ‫؍‬ Ba, Pb), have been realized; these substitutions have induced an enlargement of the cationic slab thickness and thus allowed improvement of the conductivity. The resulting modi5cations of a and c lattice constants have been interpreted on the basis of the characteristics of the substituting elements (cationic radii and symmetries) and were correlated to the observed conductivity modi5cations.

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