The effect of oxygen partial pressure on the stability of the high Tc phase (>100 K) in a Bi-Pb-Sr-Ca-Cu-O system has been studied using resistivity, x-ray diffraction, and ac susceptibility measurements. It was observed that part of the high Tc phase formed by sintering at 840 °C in a low oxygen partial pressure of 1/10 atmosphere was transformed into a low Tc phase (∼80 K) and an insulating phase by heating at the same sintering temperature in O2 of one atmosphere. The original high Tc phase was restored upon retreatment at the same temperature in a low oxygen partial pressure of 1/10 atmosphere.
No takes yet. Share an insight, caveat, or question.
Lee et al. (1989) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: