Please use this identifier to cite or link to this item: http://lib.jncasr.ac.in:8080/jspui/handle/10572/890
Title: An X-ray and neutron diffraction study of cation substituted TlSr2CuO5
Authors: Kovatcheva, D
Hewat, A W
Rangavittal, N
Manivannan, V
Row, T N Guru
Rao, C N R
Keywords: Temperature Superconductor La1.85sr0.15cuo4
Crystal-Structure
Tc
Transition
Valence
Issue Date: 15-Feb-1991
Publisher: Elsevier Science BV
Citation: Physica C : Superconductivity 173(5-6), 444–452 (1991)
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+.
Description: Restricted Access
URI: http://hdl.handle.net/10572/890
Other Identifiers: 0921-4534
Appears in Collections:Research Papers (Prof. C.N.R. Rao)

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