F. Cellucci et al., MUTUAL CONVERSION OF (BIPB)(2)SR2CAN-1CUNOX HTSCS WITH N=1, 2, 3 - TEMPERATURE AND OXYGEN PARTIAL-PRESSURE DEPENDENCE, Nuovo cimento della Societa italiana di fisica. D, Condensed matter,atomic, molecular and chemical physics, biophysics, 16(10-11), 1994, pp. 1701-1708
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 cy
cling of the sample temperature and the oxygen enrichment of the gas p
hase convert the 2201 (n = 1) phase in the 2223 (n = 3) phase in the p
resence of the 2212 (n = 2) and Ca2PbO4 compound. The in situ resistiv
ity measurements, T-c values and XRD carried out on the sample confirm
these phase changes. The experiment indicates that this process is ox
ygen dependent at low oxygen partial pressure.