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OPTIMIZATION OF SUPERCONDUCTING CRITICAL-TEMPERATURES BY CONTROL OF CATION AND ANION STOICHIOMETRY IN BI2SR2CACU2O-DELTA-BASED SOLID-SOLUTIONS

Research output: Contribution to journalArticle

Author(s)

DC SINCLAIR, JTS IRVINE, AR WEST, John Thomas Sirr Irvine

School/Research organisations

Abstract

T-c data are reported for powders of cation-stoichiometric Bi2Sr2CaCu2Odelta and for nonstoichiometric samples based on the three mechanisms Bi reversible arrow Sr, Sr reversible arrow Ca a nd Sr vacancy. For each, the T-c values depend critically on the final oxygen contents, which were varied by heating samples in either O-2 or N-2 at different temperatures. Stoichiometric Bi2Sr2CaCu2Odelta has the highest T-c, 92 K, obtained after heating in O-2 at similar to 820 degrees C. Heating in O-2 at lower temperatures gives rise to overdoping and T-c decreases to 60 K. The other cation compositions show a smaller maximum T-c but also less reduction in T-c on overdoping. Under-doped samples, with reduced T-c values were obtained on heating in N-2. These data, together with selected literature results, lead to a unified picture of the variation of T-c with cation composition and oxygen content.

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Original languageEnglish
Pages (from-to)2743-2746
Number of pages4
JournalJournal of Materials Science
Volume30
Issue number11
Publication statusPublished - 1 Jun 1995

    Research areas

  • BI2SR2CACU2OX SUPERCONDUCTOR, RANGE, CA-CU-O, T(C), SYSTEM, PHASE-EQUILIBRIA, MODULATION, OXYGEN, TC

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