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Influence of atmosphere on crystallization of zirconia from a zirconium alkoxide

Published online by Cambridge University Press:  31 January 2011

David E. Collins  and
Keith J. Bowman
David E. Collins
Affiliation:
School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907
Keith J. Bowman
Affiliation:
School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907
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Abstract

Dibutoxybis (acetylacetonato) zirconium, a difunctional zirconium alkoxide, was polymerized at 130 °C for 5 h in vacuo to produce oligomers that could be pyrolyzed to form a tetragonal zirconia (t-ZrO2), metastable at room temperature. This metastable phase was retained considerably below the equilibrium transformation temperature (∼1200 °C) without the use of dopants. Comparative pyrolysis of the oligomers between 600 and 900 °C in either flowing O2 or N2 for processing times under 12 h indicated t-ZrO2 nucleated first. Pyrolysis in oxygen facilitated transformation to the monoclinic symmetry, whereas pyrolysis in nitrogen demonstrated retention of the tetragonal phase. The formation of oxygen vacancies during pyrolysis, their role in stabilizing the metastable tetragonal phase, and contributions of O2 and crystallite size in the polymorphic transformation are discussed.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 5 , May 1998 , pp. 1230 - 1237
Copyright
Copyright © Materials Research Society 1998

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