New Bi–Ln–V–O Anionic Conductors withδ-Bi2O3Fluorite-Type Structure (Ln=Y, Sm, Eu, Gd, Tb, Dy, Er, Yb)

✍ Scribed by N. Portefaix; P. Conflant; J.C. Boivin; J.P. Wignacourt; M. Drache

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 339 KB
• Volume: 134
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1997.7483

✦ Synopsis

An extensive investigation of Bi 2 O 3 -Ln 2 O 3 -V 2 O 5 systems (Ln ‫؍‬ Y, Sm, Eu, Gd, Tb, Dy, Er, Yb) yields preservation of the metastable fcc -Bi 2 O 3 structure in large composition ranges by air-cooling from the high temperature equilibrium domain. Partial substitution of V for Ln in Bi 0.85 Ln 0.15(1؊y) V 0.15y O 1.5؉0.15y samples (04 4y4 40.45) results in a lowering of the equilibrium temperatures, as well as an increase of the stability of the related quenched phases. The best stability is observed for samples corresponding to y ‫؍‬ 0.3. The anionic conductivity reaches 10 ؊3 S/cm at 300°C and 0.5 S/cm at 700°C for Bi 0.85 Tb 0.105 V 0.045 O 1.545 .