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Factors influencing the stability of the tetragonal form of zirconia

Published online by Cambridge University Press:  31 January 2011

Ramachandra Srinivasan ,
Robert De Angelis  and
Burton H. Davis
Ramachandra Srinivasan
Affiliation:
Department of Metallurgical Engineering and Materials Science, University of Kentucky, Lexington, Kentucky 40506
Robert De Angelis
Affiliation:
Department of Metallurgical Engineering and Materials Science, University of Kentucky, Lexington, Kentucky 40506
Burton H. Davis
Affiliation:
Kentucky Center for Energy Research Laboratory, University of Louisville, P. O. Box 13015, Lexington, Kentucky 40512
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Abstract

The pH of the solution that zirconia is precipitated from defines the crystal phase formed after calcination of the material at 400°to 600°C. A metastable tetragonal form is obtained for either low (less than about 5) or high (greater than about 13) pH. The tetragonal phase formed at high pH is much more stable at the calcination temperature than the material obtained at a low pH is. For a material obtained by precipitation at a low pH, monoclinic crystallites, determined by x-ray line broadening, were obtained that were smaller than the tetragonal crystals that produced them. A crystallite size effect, based on x-ray line broadening, is not responsible for the formation or stabilization of the tetragonal phase.

Type
Articles
Information
Journal of Materials Research , Volume 1 , Issue 4 , August 1986 , pp. 583 - 588
Copyright
Copyright © Materials Research Society 1986

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