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The Bi-Sr-Ca-Cu-(Al)-O system; accompanying phases I

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Abstract

Bulk samples of superconductive cuprates BiSrCaCuO were prepared by melting of mixtures of oxides and carbonates, in alumina crucibles, using various thermal treatments. In some samples, several accompanying non-superconductive phases appeared. The later were studied by visual examination under the optical microscope, scanning electron microscopy, electron microprobe analysis and X-ray diffraction (single crystal precession and powder Gandolfi camera). Besides Bi2Sr2CaCu2O8 (further 2212) and Bi2Sr2CuO6 (2201) BiSrCaCuO phases, CuO and Ca2CuO3 (with Sr content), another phase with composition Bi4Sr1.45Ca2.31Cu0.37O10.13 was found in one sample in the form of oriented intergrowths with Cu2O. The powder diffraction data enabled us to interpret the former compound as Bi2SrCaO5 with some Sr replaced by Ca. In addition, a yellow-coloured phase of approximate composition BiSr2CaAl3O9, cubic, F-centred, (for two specimens a = 2.486(6) nm or a = 2.496(8) nm, was found in three samples heated to over 1040°C. This phase resulted from the reaction with the alumina crucible. The X-ray precession and powder data are reported.

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Authors and Affiliations

  1. Institute of Physics, Czech Republic Academy of Sciences, Cukrovarnická 10, 16200, Praha 6, Czech Republic

    J. Hybler, M. šimečková & S. Durčok

  2. Geological Survey, Malostranské náměstí 19, 11821, Praha 1, Czech Republic

    F. Veselovský

Authors
  1. J. Hybler
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  2. M. šimečková
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  3. S. Durčok
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  4. F. Veselovský
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Hybler, J., šimečková, M., Durčok, S. et al. The Bi-Sr-Ca-Cu-(Al)-O system; accompanying phases I. JOURNAL OF MATERIALS SCIENCE 28, 5603–5609 (1993). https://doi.org/10.1007/BF00367836

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  • DOI: https://doi.org/10.1007/BF00367836

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