Abstract
Samples with a nominal composition of Bi2-xSbxSr2CaCu2Oy were synthesized by the standard solid state reaction. In this paper, a new phase in these samples is identified by selected-area electron diffraction and the X-ray energy dispersive spectrum. The new phase, with composition Bi6Sr5(Ca,Sb)5Oz, belongs to the monoclinic system, A-base centred lattice, with cell dimensions a=21.73 AA, b=5.76 AA, c=19.32 AA, beta =95.0 degrees . The influence of the monoclinic phase on the improvement of superconductivity is also discussed.
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