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Cu valence states in superconducting BiPbSrCaCuO system
School of Materials Science and Engineering, University of New South Wales.
School of Materials Science and Engineering, University of New South Wales.
School of Materials Science and Engineering, University of New South Wales.
School of Materials Science and Engineering, University of New South Wales.
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1990 (Swedish)In: Journal of Solid State Chemistry, ISSN 0022-4596, E-ISSN 1095-726X, Vol. 87, no 2, p. 289-297Article in journal (Refereed) Published
Abstract [en]

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

Place, publisher, year, edition, pages
1990. Vol. 87, no 2, p. 289-297
National Category
Other Materials Engineering
Research subject
Engineering Materials
Identifiers
URN: urn:nbn:se:ltu:diva-2980DOI: 10.1016/0022-4596(90)90031-RISI: A1990DR76000006Scopus ID: 2-s2.0-0006932446Local ID: 0b9e7d40-cf6b-11de-b769-000ea68e967bOAI: oai:DiVA.org:ltu-2980DiVA, id: diva2:975835
Note

Godkänd; 1990; 20091112 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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