Kovatcheva, D. ; Hewat, A. W. ; Rangavittal, N. ; Manivannan, V. ; Guru Row, T. N. ; Rao, C. N. R. (1991) An X-ray and neutron diffraction study of cation substituted TlSr2CuO5 Physica C: Superconductivity, 173 (5-6). pp. 444-452. ISSN 0921-4534
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Official URL: http://linkinghub.elsevier.com/retrieve/pii/092145...
Related URL: http://dx.doi.org/10.1016/0921-4534(91)90746-L
Abstract
The structures of TlSr(2−x)LaxCuO(5+δ), with x=0.5, 0.75 and 1, and Tl.5Pb0.5Sr2CuO(5+δ) have been examined with X-ray and neutron powder Rietveld refinement. They are isostructural (P4/mmm) with the corresponding thallium-barium cuprate having one Cu-O layer with Cu3+ ions in octahedral coordination with oxygen (structure type 1201). The influence of cation substitution and disorder on the structure and superconducting properties of these phases have been investigated. La3+ substitution for Sr2+ stabilises the structure and reduces Cu3+, permitting superconductivity, while Pb2+ substitution for Tl3+ only stabilises the structure, without reducing Cu3+.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| ID Code: | 41871 |
| Deposited On: | 31 May 2011 12:16 |
| Last Modified: | 31 May 2011 12:16 |
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