Mutual conversion of (BiPb)SrCaCuO HTSCs with n=1, 2, 3: Temperature and oxygen partial-pressure dependence.

The transformation of the 2223 ( n=3) phase in the 2201 ( n=1) phase by heating the sample in Ar atmosphere was studied. The subsequent cycling of the sample temperature and the oxygen enrichment of the gas phase convert the 2201 ( n=1) phase in the 2223 ( n=3) phase in the presence of the 2212 ( n=2) and CaPbO compound. The in situ resistivity measurements, T values and XRD carried out on the sample confirm these phase changes. The experiment indicates that this process is oxygen dependent at low oxygen partial pressure. [ABSTRACT FROM AUTHOR]