Abstract
Ultrafine Sr-Ca-Cu-O [Sr:Ca:Cu = 1:1:2] powders having diameter of less than 200 nm was prepared by a RF-plasma CVD technique and the ultrafine powders was mixed with powdered Bi2O3 at a composition of Bi:Sr:Ca:Cu = 4:3:3:6 to synthesize the superconductive Bi-Sr-Ca-Cu-O ceramics. Then the mixed powder was sintered at 820 - 880°C for 10 - 60 min.When the mixed powder is sintered at 820 - 850°C for 10 min, the high-Tc phase (110K) is formed in the sintered specimen, but sintering longer than about 30 min caused a decrease in the high-Tc phase. In the case of sintering temperature at 860 - 880°C, only the low-Tc phase (80 K) is formed in the sintered specimen.
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