Crystal structure of TlBa2Ca2Cu3O9

Subramanian, M. A. ; Parise, J. B. ; Calabrese, J. C. ; Torardi, C. C. ; Gopalakrishnan, J. ; Sleight, A. W. (1988) Crystal structure of TlBa2Ca2Cu3O9 Journal of Solid State Chemistry, 77 (1). pp. 192-195. ISSN 0022-4596

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Crystals of the 110 K superconductor TlBa2Ca2Cu3O9 have been grown and the structure refined from single-crystal X-ray diffraction data: a = 3.853(1), C = 15.913(4)Å, space group P4/mmm, R = 0.055, Rw = 0.057. The structure contains triple copper-oxygen sheets separated by Ca ions which show ~5% Tl substitution. These units alternate with single Tl---O layers. The existence of correlated atomic displacements within the thallium-oxygen sheets is again suggested by a disordered Tl---O arrangement in the average structure. The triple Cu---O sheets in TlBa2Ca2Cu3O9 are stacked directly above each other, whereas in Tl2Ba2Ca2Cu3O10, which contains double Tl---O sheets, alternate units are shifted by (a1 + a2)/2.

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ID Code:12281
Deposited On:10 Nov 2010 05:11
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