Abstract
T c data are reported for powders of cation-stoichiometric Bi2Sr2CaCu2Oδ and for nonstoichiometric samples based on the three mechanisms Bi⇄Sr, Sr⇄Ca and Sr vacancy. For each, the T c values depend critically on the final oxygen contents, which were varied by heating samples in either O2 or N2 at different temperatures. Stoichiometric Bi2Sr2CaCu2Oδ has the highest T c, 92 K, obtained after heating in O2 at ∼ 820 °C. Heating in O2 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 N2. 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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Sinclair, D.C., Irvine, J.T.S. & West, A.R. Optimization of superconducting critical temperatures by control of cation and anion stoichiometry in Bi2Sr2CaCu2Oδ-based solid solutions. JOURNAL OF MATERIALS SCIENCE 30, 2743–2746 (1995). https://doi.org/10.1007/BF00349639
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DOI: https://doi.org/10.1007/BF00349639