Research output: Contribution to journal › Article › peer-review
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.
Original language | English |
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Pages (from-to) | 2743-2746 |
Number of pages | 4 |
Journal | Journal of Materials Science |
Volume | 30 |
Issue number | 11 |
Publication status | Published - 1 Jun 1995 |
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Research output: Contribution to journal › Article › peer-review
Research output: Contribution to journal › Article › peer-review
Research output: Contribution to journal › Article › peer-review
Research output: Contribution to journal › Article › peer-review
Research output: Contribution to journal › Article › peer-review
Finlay Morrison (Reviewer)
Activity: Publication peer-review and editorial work types › Peer review of manuscripts
Research output: Contribution to journal › Article › peer-review
Research output: Contribution to journal › Article › peer-review
Research output: Contribution to journal › Article › peer-review
Research output: Contribution to journal › Article › peer-review
Research output: Contribution to journal › Article › peer-review
ID: 47289863