✦ LIBER ✦

Crystal structure and valency properties of superconducting phases of Ba(Pb, Bi, Sb)O3 perovskites

✍ Scribed by K. Bente; W. Blum; R. Gaebel; J. Pebler; P. Schmid-Beurmann

Publisher: Elsevier Science
Year: 1992
Tongue: English
Weight: 562 KB
Volume: 202
Category: Article
ISSN: 0921-4534
DOI: 10.1016/0921-4534(92)90183-d

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✦ Synopsis

At 800-850°C in air the Ba(Sb, Bi, Pb)Os system is pseudo-ternary showing an extended solid solution series in the inner part. In the binary section between the two superconducting perovskites BaPb0.r5BiclsOs and BaPb&bc150s an increasing Sb-content is correlated with a decreasing T, and a transition from monoclinic to tetragonal symmetry. A single crystal study of a BaPbc.,cSbr,.2cBis.orOs crystal showed that solid solution members with lower BaPbOs-content than those of the BaPbo.rl(Sb, Bi)Os intersection become cubic. Valency investigations on Sb in BaPba.&Bi, Sb)O.zsOJ and BaPbc.,ISb0.z50s by '*'Sb-M&asbauer spectroscopy confvmed the valency of Sb to be 5 + independently of composition.

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