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Räth, S.; Schmahl, Wolfgang W.; Woodall, L.; Bartels, M.; Gerards, M. (2000): Phase assemblage in PBSSCO OPIT high-temperature superconductor precursor powders - Rietveld analysis of x-ray diffractograms. In: Materialwissenschaft und Werkstofftechnik, Vol. 31, No. 9: pp. 829-832
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The phase assemblage in PBSCCO-2223, (Bi, Pb)2Sr2 Ca2Cu3O10 + x, precursor powders used for the production of long lengths of superconducting tapes by the oxide powder in tube (OPIT) technology has been determined by Rietveld analysis of powder x-ray diffractograms. The effects of grain alignment, structure modulation and anisotropic line broadening have been taken into account in the Rietveld analysis. The phase assemblage of the air-annealed precursor is typically Pb-free 2212 (Bi, Pb)2Sr2CaCu2O8 + x, Pb3Sr3Ca2CuO12, Ca2PbO4, Sr6Ca8Cu24O41, and Ca0.79Sr0.04CuO2. If the annealing is done in N2, the Pb4+ phases disappear and Pb2+ enters the 2212 phase, which is accompanied mainly by Ca2CuO3 and CuO. Pb-2223 formation occurs above 830 °C in air.