Abstract
Superconducting Bi(Pb)‐Sr‐Ca‐Cu‐O powders were prepared by the emulsion‐drying method The powders consisting of the low‐Tc phase (Bi(Pb)2Sr2Ca1Cu2Oy) and small amount of Ca2PbO4 were prepared by calcining under low oxygen partial pressure at 750°, 800°C. These calcined powders were used to prepare thick films on single‐crystal MgO(100) substrates using a screen‐printing technique to study the effect of the calcinations temperature and annealing procedure on the high‐Tc phase (Bi(Pb)2Sr2Ca2Cu3Oy)formation. The formation of high‐Tc phase was observed to be dependent on the calcinations conditions. The high‐Tc phase formed very quickly (sintering at 840°C for 4 h), and the best films showed a sharp superconducting transition at about 105 K.
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