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Cu valence states in superconducting BiPbSrCaCuO system
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- Liu, H.K. (author)
- School of Materials Science and Engineering, University of New South Wales
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- Dou, S.X. (author)
- School of Materials Science and Engineering, University of New South Wales
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- Song, K-H (author)
- School of Materials Science and Engineering, University of New South Wales
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- (creator_code:org_t)
- 1990
- 1990
- Swedish.
- In: Journal of Solid State Chemistry. - 0022-4596 .- 1095-726X. ; 87:2, s. 289-297
- Journal article (peer-reviewed)
Abstract
Subject headings
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- The oxidation states of Bi, Pb, and Cu in the BiPbSrCaCuO (BPSCCO) system have been determined by a combination of volumetric measurement technique and iodometric titration. It was found that, in contrast to previous reports, the concentration of the Cu3+ ions decreased with increasing Pb content, and Cu3+ ions were absent in samples of Bi1.6Pb0.4Sr1.6Ca2Cu3O9.8, while a Tc at 108 K and a Jc of greater than 12,000 A/cm2 at 77 K were observed. The 110 K phase in BPSCCO was stabilized and showed a high tolerance to change in oxygen partial pressure during sintering. In Pb-doped materials, Bi appears to be trivalent while Pb was determined to be mixed-valence Pb4+ Pb2+. It is suggested that superconductivity in BPSCCO may result from a dynamic transfer of holes from Bi PbO layers toward CuO2 planes
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Annan materialteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Other Materials Engineering (hsv//eng)
Keyword
- Materialteknik
- Engineering Materials
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- ref (subject category)
- art (subject category)
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- Dou, S.X.
- Song, K-H
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- Jones, W.K.
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- Luleå University of Technology
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