Structures of the superconducting oxides Tl2Ba2CuO6 and Bi2Sr2CuO6

Torardi, C. C. ; Subramanian, M. A. ; Calabrese, J. C. ; Gopalakrishnan, J. ; McCarron, E. M. ; Morrissey, K. J. ; Askew, T. R. ; Flippen, R. B. ; Chowdhry, U. ; Sleight, A. W. (1988) Structures of the superconducting oxides Tl2Ba2CuO6 and Bi2Sr2CuO6 Physical Review B, 38 (1). pp. 225-231. ISSN 0163-1829

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The structures of Tl2Ba2CuO6 and Bi2Sr2CuO6 have been solved and refined from single-crystal x-ray diffraction data. The structures are essentially the same and have single Cu-O sheets separated by either Tl-O or Bi-O double layers. The Tl2Ba2CuO6 structure is tetragonal with a=3.87 Å and c=23.24 Å, and there are strictly flat Cu-O sheets. Bi2Sr2CuO6 has a lower-symmetry structure which may be approximated with an orthorhombic cell with a=5.36 Å, b=5.37 Å, and c=24.62 Å; however, this ignores superstructure reflections along both the a and c axes. The Tl-O layers are much more strongly bound to each other than are the Bi-O layers; thus, better conduction along the c axis is expected for Tl2Ba2CuO6 relative to Bi2Sr2CuO6. Superconducting transition temperatures of 9 and 90 K were observed for Bi2Sr2CuO6 and Tl2Ba2CuO6, respectively.

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ID Code:12230
Deposited On:10 Nov 2010 04:56
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