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Crystal structure of hafnia–zirconia mixtures obtained by calcination of hydrous oxide prepared by precipitation

Published online by Cambridge University Press:  31 January 2011

Li-Min Tau ,
Ram Srinivasan ,
Robert J. De Angelis ,
Tim Pinder  and
Burtron H. Davis
Li-Min Tau
Affiliation:
Kentucky Energy Cabinet Laboratory, P. O. Box 13015, Lexington, Kentucky 40512
Ram Srinivasan
Affiliation:
Kentucky Energy Cabinet Laboratory, P. O. Box 13015, Lexington, Kentucky 40512
Robert J. De Angelis
Affiliation:
Kentucky Energy Cabinet Laboratory, P. O. Box 13015, Lexington, Kentucky 40512
Tim Pinder
Affiliation:
Kentucky Energy Cabinet Laboratory, P. O. Box 13015, Lexington, Kentucky 40512
Burtron H. Davis
Affiliation:
Kentucky Energy Cabinet Laboratory, P. O. Box 13015, Lexington, Kentucky 40512
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Abstract

The pH of the solution in contact with a hydrous zirconium oxide plays a dominant role in determining the crystal phase, tetragonal or monoclinic, in the calcined material. The substitution of low concentrations of hafnium for zirconium destabilizes the tetragonal phase so that only the monoclinic phase is formed; the amount of Hf required for destabilization depends upon the pH used for the preparation of the hydrous oxide. While this study has defined a phenomenon, the results do not permit a definition of the mechanism for it.

Type
Articles
Information
Journal of Materials Research , Volume 3 , Issue 3 , June 1988 , pp. 561 - 562
Copyright
Copyright © Materials Research Society 1988

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References

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