A substructure with a pseudotetragonal unit cell is proposed for a low-T c superconducting oxide Bi-Sr-Cu-O system on the basis of Rietveld analysis of powder X-ray diffraction data. It is a layered structure having the composition Bi2Sr2CuO y . The relationship between the crystal structure of the Bi-Sr-Ca-Cu-O system and that of Bi-Sr-Cu-O system was discussed.
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Sawa et al. (1988) studied this question.
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