Abstract
The phase assemblage in PBSCCO precursor powders for 2223-OPIT production has been investigated in a quantitative way with Rietveld analysis of x-ray powder diffractograms. The investigated precursors were made by spray pyrolysis of solutions of the appropriate bulk chemical composition of Pb/sub 0.33/Bi/sub 1.80/Sr/sub 1.87/Ca/sub 2.00/Cu/sub 3.00/O/sub 10 /+/sub /spl delta//, and subsequent calcination to remove volatile elements and to form a suitable precursor phase assemblage at temperatures between 800/spl deg/C and 820/spl deg/C, in air or under reducing conditions. The influence of temperature and atmosphere on the powder quality was investigated with regard to different minor phases, and the Pb-content of the 2212-phase.
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