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Raman Spectroscopy and Structural Disorder in Gd2(ZrxTi1−x)2O7

Published online by Cambridge University Press:  21 February 2011

M. Oueslati,
M. Balkanski,
P.K. Moon and
H.L. Tuller
M. Oueslati
Affiliation:
Laboratoire de Physique des Solides, Universite Pierre et Marie Curie, 75230 Paris Cedex, France
M. Balkanski
Affiliation:
Laboratoire de Physique des Solides, Universite Pierre et Marie Curie, 75230 Paris Cedex, France
P.K. Moon
Affiliation:
Crystal Physics & Optical Electronics Laboratory, Department of Materials Science & Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
H.L. Tuller
Affiliation:
Crystal Physics & Optical Electronics Laboratory, Department of Materials Science & Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
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Abstract

Raman measurements on the Gd2(ZrxTi1−x)2O7, solid solution show increasing peak widths as the composition is varied from Gd2 Ti2O7, to Gd2 Zr2,O7. The increase in peak width is interpreted as reflecting an increase in structural disorder with increasing x in this pyrochlore structure material. Structural disorder occurs readily in such oxides by the formation of cation anti-site defects and anion frenkel defects. We have previously observed that this leads to a marked increase in oxygen ion conduction with increasing x. Preliminary results also indicate that certain peaks in the Raman spectra are characteristic of the end members of the solid solution and may occur at the same frequency independent of composition. The Raman results are discussed in relation to earlier x-ray diffraction and ionic conductivity data obtained in this group.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 135: Symposium M – Solid State Ionics I , 1988, 199
Copyright
Copyright © Materials Research Society 1989

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References

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