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Oxygen Deficiency in Perovskite-Type Superconductiong BaPb1-xBixO3-δ

This paper presents the determination of oxygen, barium, lead and bismuth in the ceramic BaPb1-xBixO3-δ using activation analysis and isotope dilution method. The oxygen concentration is close to the theoretical value in the range of 0.0≤x≤0.3, being minimum at x=0.4 and larger than the value at 0.6≤x≤0.8. It is also found that lead is lost through volatilization, that barium is excess and that the bismuth content, x, is different before and after preparation of BPB. Oxygen deficiency, δ, is 0. 19 at x=0.4 and 1.0. The oxygen deficiency might in fact be related to metal-semiconductor transition.