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Syntactic Intergrowth Problems with Bcsco and Fabrication Difficulties Therefrom
Published online by Cambridge University Press: 25 February 2011
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Bismuth containing oxide superconductors were first encountered in the BaPb1−xBxO3 perovskites [1]. In the the YBa2Cu3Ox family, bismuth was a possible substitute for yttrium and was attempted by us many months ago (and undoubtedly by many other groups) with the result that, under the necessary oxidizing conditions, BaBiO3 formed as a separate phase. Attempts to substitute bismuth into the La2−xSrxCuO4 family were reported [2], with the intriguing result of a 42K superconductor with T c higher than the previous 38K high for the family. A second paper [3] discussed the new compound “Bi2Sr2Cu7+δ, a = 5.32Å, b = 26.6Å, C = 48.8Å”, with TC of 7K to 22K; this was confirmed, but C = 24.4Å was found [4], and it is now clear that this compound is ideally Bi2Sr2CuO6+δ. A higher Tc than in BaPb1−xBixO3 was next detected in the Ba-K-Bi-O system [5]. Work at the Japanese National Research Institute of Metals [6] then disclosed T_ of as high as ∼ 105K in the Bi-Ca-Sr-Cu-O (BCSCO) system; both Ca and Sr must be present to produce these higher values.
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- Copyright © Materials Research Society 1988
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