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CHARACTERIZATION OF CA-DOPED BI2+XSR2-XCUOZ

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Author(s)

DC SINCLAIR, John Thomas Sirr Irvine, AR WEST

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Abstract

The 'R' phase in the Bi-Sr-Cu-O system, which is actually a solid solution of formula Bi2+xSr2-xCuOz, forms an extensive solid solution by partial substitution of Ca for Sr. This has formula, Bi2+xSr2-x-yCayCuOz, with 0 <y less-than-or-similar-to 0.45 and 0.15 less-than-or-similar-to x less-than-or-similar-to 0.40 at 800-degrees-C Lattice parameters of the solid solutions are given; pseudotetragonal symmetry is retained throughout but the incommensurate superstructure becomes less marked with increasing contents of both Ca and Bi. The excess oxygen content of the solid solutions, determined by iodometry, is unchanged by replacement of Sr by Ca, but for a given composition, can be varied by heating at 750-degrees-C in different atmospheres.

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Original languageEnglish
Pages (from-to)147-148
Number of pages2
JournalJournal of Materials Chemistry
Volume1
Issue number1
Publication statusPublished - Jan 1991

    Research areas

  • OXIDE SUPERCONDUCTOR, SERIES, BI-SR-CU-O SYSTEM, INCOMMENSURATE STRUCTURE

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