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Oxygen deficiency, crystal system and conduction behavior of BaPb0.75Bi0.25O3-δ

✍ Scribed by Takuya Hashimoto; Ryo Hirasawa; Jun Komiya; Hidefumi Hirai; Hideki Tanaka; Hiroaki Tagawa; Junichiro Mizusaki

Publisher
American Institute of Chemical Engineers
Year
1997
Tongue
English
Weight
507 KB
Volume
43
Category
Article
ISSN
0001-1541

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✦ Synopsis

The variation of crystal system and conduction behavior of perovskite superconductor, BaPbo.75Bi0.2503-S, with oxygen deficiency was studied. The crystal system of BaPb,,,, BiO,,,O3. changed from orthorhombic through tetragonal to pseudo-cubic as 6 increases. The superconducting transition was observed in the specimens with the orthorhombic phase. Oxygen-deficient specimens with tetragonal or pseudo-cubic symmetly did not show a superconducting transition. The increase in electrical resistivity was also observed with an increase in 6, which suggested decrease of electron cam'er mobility with the increase in 6. This effect of oxygen deficiency on conduction behavior of BaPb,., Bi0,2503-S showed contrast with those of the superconducting cuprates, in which cam'er concentration is affected instead of cam'er mobility. The difference in the effects of oxygen deficiency on conduction behavior could be attributed to the difference of crystal structure between BaPb,,, Bio,2503. and superconducting cuprates.

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