Abstract
The new chemical method of the phase analysis, differential dissolution was used to determine the amount and the composition of each phase in multiphase samples of the BiPbCaSrCuO system. The results obtained were in agreement with the x-ray, X (T), microprobe analysis data. The 50% Bi lack has been observed for the high Tc-phase with 2223 structure. It was shown that the most of crystalline grains of low Tc-phase with 2212 structure are smaller than 10 −5 cm in size. These facts are believed to result from the formation mechanism of superconducting phases. The later is discussed as well.
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