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Phase Transformations in ZrO2-SiO2 Gels

Published online by Cambridge University Press:  28 February 2011

J. Campaniello ,
E. M. Rabinovich ,
P. Berthet ,
A. Revcolevschi  and
Nonna A. Kopylov
J. Campaniello
Affiliation:
Universite de Paris-Sud, Laboratoire de Chemie des Solides, 91405 Orsay cedex, France.
E. M. Rabinovich
Affiliation:
AT&T Bell Laboratories, Murray Hill, NJ 07974, USA.
P. Berthet
Affiliation:
Universite de Paris-Sud, Laboratoire de Chemie des Solides, 91405 Orsay cedex, France.
A. Revcolevschi
Affiliation:
Universite de Paris-Sud, Laboratoire de Chemie des Solides, 91405 Orsay cedex, France.
Nonna A. Kopylov
Affiliation:
AT&T Bell Laboratories, Murray Hill, NJ 07974, USA.
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Abstract

Transparent sols and gels in the ZrO2-SiO2 system containing 25, 50 and 75 mole % ZrO2 were prepared using tetraethyl orthosilicate (TEOS) and Zr n-propoxide solution in the presence of acids. Heating the gels to 600°C yielded an amorphous product which at higher temperature crystallized with formation of tetragonal and monoclinic ZrO2 . Zircon crystallized slowly at 1600°C. The results are explained by metastable liquid-liquid phase separation in the studied system.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 180: Symposium A – Better Ceramics Through Chemistry IV , 1990 , 541
Copyright
Copyright © Materials Research Society 1990

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References

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