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Short-Range Ordering by Displacement of Tl and O Atoms in Tl2CaBa2cu2O8 Studied by Pair Distribution Function and Rietveld Analysis

Published online by Cambridge University Press:  21 February 2011

B. H. Toby ,
W. Dmowskia ,
T. Egami ,
J. D. Jorgensen ,
M. A. Subramanian ,
J. Gopalakrishnan  and
A. W. Sleight
B. H. Toby
Affiliation:
Department of Materials Science and Engineering and Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, Pennsylvania 19104–6272.
W. Dmowskia
Affiliation:
Department of Materials Science and Engineering and Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, Pennsylvania 19104–6272.
T. Egami
Affiliation:
Department of Materials Science and Engineering and Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, Pennsylvania 19104–6272.
J. D. Jorgensen
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439.
M. A. Subramanian
Affiliation:
Central Research and Development Department, E. I. du Pont de Nemours and Company, Experimental Station, Wilmington, Delaware 19898.
J. Gopalakrishnan
Affiliation:
Central Research and Development Department, E. I. du Pont de Nemours and Company, Experimental Station, Wilmington, Delaware 19898.
A. W. Sleight
Affiliation:
Central Research and Development Department, E. I. du Pont de Nemours and Company, Experimental Station, Wilmington, Delaware 19898.
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Abstract

Atomic pair distribution function analysis has demonstrated displacements of Tl and O atoms within the Tl-O layers with shortrange ordering of lower symmetry than the crystallographic lattice. Two models have been proposed for these displacements. Rietveld analysis neither confirms nor contradicts these models. Temperature-dependent PDF measurements show changes in local structure correlating with temperature.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 156: Symposium M – High Temperature Superconductors: Relationships Between Properties, Structure, and Solid State Chemistry , 1989 , 309
Copyright
Copyright © Materials Research Society 1989

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References

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