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Enthalpy of formation of cubic yttria-stabilized hafnia

Published online by Cambridge University Press:  03 March 2011

Theresa A. Lee  and
Alexandra Navrotsky
Theresa A. Lee
Affiliation:
NEAT ORU and Thermochemistry Facility, University of California at Davis, Davis, California 95646-8779
Alexandra Navrotsky*
Affiliation:
NEAT ORU and Thermochemistry Facility, University of California at Davis, Davis, California 95646-8779
*
b)Address all correspondence to this author.e-mail: [email protected]
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Abstract

The enthalpy of formation of cubic yttria-stabilized hafnia from monoclinic hafnia and C-type yttria was measured by oxide melt solution calorimetry. The enthalpies of formation fit a function independent of temperature and quadratic in composition. The enthalpies of transition from m-HfO2 and C-type YO1.5, to the cubic fluorite phase are 32.5 ± 1.7 kJ/mol and 38.0 ± 13.4 kJ/mol, respectively. The interaction parameter in the fluorite phase is strongly negative, -155.2 ± 10.2 kJ/mol, suggesting even stronger short range order than in ZrO2–YO1.5. Regular solution theory or any other model assuming random mixing on the cation and /or anion sublattice is not physically reasonable. A more complex solution model should be developed to be consistent with the new calorimetric data and observed phase relations.

Keywords

CeramicCalorimetryThermodynamic properties
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 6 , June 2004 , pp. 1855 - 1861
Copyright
Copyright © Materials Research Society 2004

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