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A neutron diffraction study on a typical highly defective ceria–yttria solid solution

Published online by Cambridge University Press:  06 March 2012

Keka R. Chakraborty ,
S. V. Chavan  and
A. K. Tyagi
Keka R. Chakraborty
Affiliation:
Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
S. V. Chavan
Affiliation:
Applied Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
A. K. Tyagi*
Affiliation:
Applied Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
*
a)Author to whom correspondence should be addressed; electronic mail: aktyagi@magnum.barc.ernet.in
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Abstract

It was seen during the phase relation studies on the CeO2–YO1.5 system that the ceria is able to accommodate a large anion deficiency caused by aliovalent substitution. A neutron powder diffraction study has been carried out at room temperature for the titled solid solution, Ce1−xYxO2−x/2 with x=0.32, which is an anion-deficient variant of the ideal fluorite structure. The structure has been found to be face centered cubic. No superlattice reflections have been observed indicating that the vacancies occupy the random positions in this highly defective solid solution. The bond distances and angles are also being reported.

Type
Technical Articles
Information
Powder Diffraction , Volume 17 , Issue 4 , December 2002 , pp. 278 - 280
Copyright
Copyright © Cambridge University Press 2002

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