Phase assemblage in PBSSCO OPIT high-temperature superconductor precursor powders - Rietveld analysis of x-ray diffractograms

Räth, S.; Schmahl, Wolfgang W.; Woodall, L.; Bartels, M. und Gerards, M. (2000): Phase assemblage in PBSSCO OPIT high-temperature superconductor precursor powders - Rietveld analysis of x-ray diffractograms. In: Materialwissenschaft und Werkstofftechnik, Bd. 31, Nr. 9: S. 829-832

Abstract

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.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Geowissenschaften > Department für Geo- und Umweltwissenschaften > Kristallographie und Materialwissenschaft
• Themengebiete: 500 Naturwissenschaften und Mathematik > 550 Geowissenschaften, Geologie
• Sprache: Englisch