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Characterization of Pb- and Ca-doped Bi2+xSr2−xCuO6+δ

Published online by Cambridge University Press:  29 June 2016

D. C. Sinclair ,
J. T. S. Irvine  and
A. R. West
D. C. Sinclair
Affiliation:
Department of Chemistry, University of Aberdeen, Meston Walk, Aberdeen AB9 2UE, Scotland, United Kingdom
J. T. S. Irvine
Affiliation:
Department of Chemistry, University of Aberdeen, Meston Walk, Aberdeen AB9 2UE, Scotland, United Kingdom
A. R. West
Affiliation:
Department of Chemistry, University of Aberdeen, Meston Walk, Aberdeen AB9 2UE, Scotland, United Kingdom
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Abstract

A phase diagram study has been made to determine the range of compositions of single phase, Pb-doped R solid solutions in the Bi–Sr–Pb–Cu–O system. These have the formula Bi2+x−zPbzSr2−xCuO6+δ, with 0.15 < x < 0.40 and 0 < z < 0.55 at 750 °C. With increasing z, the unit cell symmetry changes from tetragonal to orthorhombic; cell parameters are given as a function of x and z. From the compositional extent of the solid solutions, in terms of x and z, it is possible to infer that Pb enters predominantly “Bi” sites but also “Sr” sites, in the crystal structure of the R phase, in contrast to Ca which appears to enter exclusively the “Sr” sites. The change from tetragonal to orthorhombic symmetry may be interpreted as indicating the onset of Pb occupation of the “Bi” sites.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 1 , January 1992 , pp. 43 - 47
Copyright
Copyright © Materials Research Society 1992

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References

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