The microstructures of high-T c superconductor GdBa2Cu3O7-δ prepared under various sintering conditions were observed by using SEM and EPMA. The second phase was found on the grain boundaries of the samples sintered at temperatures higher than 970°C. The phase was confirmed to consist of more Ba and less Gd in comparison with the composition of the grain.
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Matsuda et al. (1988) studied this question.
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