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The microstructure of a high-T c superconducting Bi-Ca-Sr-Cu-O ceramic, produced by rapid solidification and annealing, was investigated by analytical transmission electron microscopy. It was found that the predominant superconducting phase in the polyphase material corresponded to Bi 2 CaSr 2 Cu 2 O 8+ delta . This phase formed during annealing at 860 degrees C by crystallisation of an amorphous material produced by rapid solidification. Evidence was obtained for variation of interplanar spacings and the existence of special 'c-plane grain boundaries' within the high-T c phase.
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Liu et al. (1989) studied this question.
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