Mutual Conversion of (BiPb)2Sr2Can-1CunOx 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 Ca2Pb04 compound. The in situ resistivity measurements, Te values and XRD carried out on the sample conf'u'm these phase changes. The experiment indicates that this process is oxygen dependent at low oxygen partial pressure.