The high-T c phase (110 K) of the Bi 2-x Pb x Sr 2 Ca 2 Cu 3 O y system has been synthesised and the role of Bi/Pb substitution has been studied extensively using X-ray diffraction studies, electrical resistivity and magnetisation measurements and scanning electron microscopy. It was found that the best results were obtained for x=0.2-0.3 and that a 'step sintering process' is necessary for a better control of the thermal process.
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Pissas et al. (1990) studied this question.
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