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Effects of Diffusion of Co/Ni Cations on Sol-Gel Derived ZrO2 Polymorphic Transformations

Published online by Cambridge University Press:  21 February 2011

H.C. Zeng  and
M. Qian
H.C. Zeng
Affiliation:
Department of Chemical Engineering, Faculty of Engineering National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260
M. Qian
Affiliation:
Department of Chemical Engineering, Faculty of Engineering National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260
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Abstract

Transition metal incorporated ZrO2 gel matrices have been prepared by impregnation method and investigated with FTIR/DTA/XRD. The metastable tetragonal - monoclinic -tetragonal - cubic phase transformations are revealed in the DTA heating process up to 1400°C for the studied gels. High-temperature tetragonal to monoclinic transition is also observed in the cooling process. It is found that the diffusing metal cations stabilize the low-temperature tetragonal phase. However, for high-temperature (900°C) calcined gels, both as-prepared and metal-stabilized tetragonal phases are reduced substantially. Correlations between metal diffusion and gel polymorphic stabilities are also demonstrated.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 398: Symposium C – Thermodynamics and Kinetics of Phase Transformations , 1995 , 655
Copyright
Copyright © Materials Research Society 1998

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References

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