We report a 105 K superconducting phase crystallized at 883°C as a major phase with large grain sizes. X-ray powder diffraction showed a very broad 002 reflection of 17.8 Å, although chemical compositions were relatively homogeneous. The 105 K phase has a Cu-rich and Bi-poor composition compared with the 80 K superconducting phase.
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Ono et al. (1988) studied this question.
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