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Search: WFRF:(Song W) > (1990-1994)

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  • Liu, H.K., et al. (author)
  • Cu valence states in superconducting BiPbSrCaCuO system
  • 1990
  • In: Journal of Solid State Chemistry. - 0022-4596 .- 1095-726X. ; 87:2, s. 289-297
  • Journal article (peer-reviewed)abstract
    • 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
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  • Result 1-1 of 1
Type of publication
journal article (1)
Type of content
peer-reviewed (1)
Author/Editor
Liu, H. -K (1)
Easterling, Kenneth ... (1)
Dou, S.X. (1)
Song, K.H. (1)
Sorrell, C.C. (1)
Jones, W.K. (1)
University
Luleå University of Technology (1)
Language
Swedish (1)
Research subject (UKÄ/SCB)
Engineering and Technology (1)
Year
1990 (1)

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