High-T c superconducting thick films were prepared using fine powders obtained by spray pyrolysis. The 110 K phase was predominantly formed in the films heat-treated at 855°C. The films prepared using fine powders with an average particle size of 1.4 µm showed a higher T c(zero) of 105 K compared with those using powders of 0.8 µm.
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Tatsumisago et al. (1991) studied this question.
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