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Crystal chemistry of the compound Sr2Bi2CuO6

Published online by Cambridge University Press:  31 January 2011

R. S. Roth ,
C. J. Rawn  and
L. A. Bendersky
R. S. Roth
Affiliation:
National Institute of Standards and Technology, Gaithersburg, Maryland 20899
C. J. Rawn
Affiliation:
National Institute of Standards and Technology, Gaithersburg, Maryland 20899
L. A. Bendersky
Affiliation:
National Institute of Standards and Technology, Gaithersburg, Maryland 20899
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Abstract

The compound Sr2Bi2CuO6 should nominally be the phase with n = 1 of the high Tc superconducting series Sr2Bi2CanO4+2n. However, the superconducting phase with n = 1 (with no CaO) occurs only with a gross deficiency in SrO content. Instead, at the composition Sr2Bi2CuO6, a different phase is formed with an x-ray diffraction pattern considerably different from that expected for the n −1 member of the series. This phase has been found, by a combination of electron diffraction and single crystal and powder x-ray diffraction, to have a commensurate lattice with monoclinic symmetry, space group C2/m or Cm, a = 24.473 (2), b = 5.4223 (5), c = 21.959 (2)A, and β = 105.40 (1)°. The actual composition of this phase may be deficient in CuO by as much as 1.0 mole %.

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Type
Articles
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Journal of Materials Research , Volume 5 , Issue 1 , January 1990 , pp. 46 - 52
Copyright
Copyright © Materials Research Society 1990

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References

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