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Hydrothermal crystallization kinetics of m-ZrO2 and t-ZrO2

Published online by Cambridge University Press:  31 January 2011

Raymond P. Denkewicz Jr. ,
Kevor S. TenHuisen  and
James H. Adair
Raymond P. Denkewicz Jr.
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802
Kevor S. TenHuisen
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802
James H. Adair
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802
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Abstract

The isothermal nucleation and crystallization kinetics of hydrothermally prepared monoclinic and tetragonal ZrO2 have been determined at various pH conditions. It is shown that monoclinic ZrO2 precipitates at low pH whereas at high pH tetragonal ZrO2 crystallizes from an amorphous zirconium (hydrous) oxide, Zr(OH)xOy, precursor. At intermediate pH conditions mixtures of the polymorphs are formed suggestive of kinetically competing particle formation mechanisms. The data are explained by the proposed existence of three controlling regimes for the formation of crystalline ZrO2: dissolution/precipitation at low pH, a solubility controlled regime at intermediate pH values, and a gel structure controlled regime at high pH. Apparent activation energies for the nucleation and crystallization of monoclinic and tetragonal ZrO2 formed under hydrothermal conditions are presented.

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Articles
Information
Journal of Materials Research , Volume 5 , Issue 11 , November 1990 , pp. 2698 - 2705
Copyright
Copyright © Materials Research Society 1990

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