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Author Khasanova, N. R. ♦ Yoshida, K. ♦ Yamamoto, A. ♦ Tajima, S. ♦ Izumi, F. ♦ Kamiyama, T.
Sponsorship New Energy and Industrial Technology Development Organization, Tokyo (Japan)
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ CRYSTAL STRUCTURE ♦ POTASSIUM OXIDES ♦ BISMUTH OXIDES ♦ NEUTRON DIFFRACTION ♦ SUPERCONDUCTIVITY ♦ CRYSTALLOGRAPHY ♦ EXPERIMENTAL DATA
Abstract The structure of a superconducting oxide (K{sub 0.87}Bi{sub 0.13})BiO{sub 3} ({Tc} {approx} 10.2 K) prepared under high pressure was analyzed by time-of-flight neutron powder diffraction. Rietveld refinement showed this compound to be a cubic perovskite ABO{sub 3} with space group Pm{bar 3}m (No. 221) and lattice parameter a = 4.23377(3) {angstrom}. Refinement of occupation factors revealed the absence of oxygen vacancies and the substitution of Bi{sup 3+} ions for 13% of K{sup +} ions at the A site, presenting evidence for electron doping in this superconductor. Extraordinarily large atomic displacement parameters for the A and O sites are believed to reflect pronounced positional disorder mainly arising from the large difference in size between the K{sup +} and Bi{sup 3+} ions.
ISSN 00224596
Educational Use Research
Learning Resource Type Article
Publisher Date 1999-04-01
Publisher Place United States
Journal Journal of Solid State Chemistry
Volume Number 144
Issue Number 1


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