Abstract
Oxygen sorption-desorption behaviors as well as superconducting properties were examined for a series of 2212-isostructural oxides, Bi 2Sr 2−xCa 1+xCu 2O y ( x=0–1.0). It was found that oxygen sorption and desorption at temperatures below 600 °C brought about reversible shifts of Tc in a manner dependent on x. Quantitative determination of oxygen content (y) revealed that, as y decreased with oxygen desorption from the as-prepared levels, Tc increased monotonically for x=0 and 0.25, while it went through a maximum at y=8.15 for x=0.8.
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