Chemistry and superconducting behavior of Sb-substituted Bi/Pb-based oxides

✍ Scribed by C.W. Kimball; W. Peng; R.H. Hannon; H. Lee; A.P. Genis; V.J. Melim; B. Dabrowski; D.R. Richards; D.G. Hinks

• Publisher: Elsevier Science
• Year: 1989
• Tongue: English
• Weight: 115 KB
• Volume: 162-164
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(89)90934-9

✦ Synopsis

The effect of Sb-substitution for Bi has been studied in the high T c Bi-based oxide superconducting compounds Pbo.3Bil.8.xSbxSrl.9Ca2Cu30y (0 < x S 0.3).

The solubility of Sb is quite low and its substitution for Bi leads to a complex chemistry with the formation of a new phase whose fractional concentration increases with increasing Sb content.

The superconducting T c is depressed by the addition of Sb for materials prepared in an oxidizing atmosphere, but is not affected if preparation is in a mildly oxidizing atmosphere.

No T c above 11OK is found for any Sb-doped Pb/Bi 2223 compounds.

A 121Sb MOssbauer effect study of the microchemistry shows that Sb is in a valence state near 5+ for all compositions.