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Enthalpy of formation of cubic yttria-stabilized hafnia

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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.

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Authors and Affiliations

  1. Nuclear Materials and Technology Division, NMT-16, MS G721, Los Alamos National Laboratory, New Mexico, 87545, Los Alamos, USA

    Theresa A. Lee

  2. NEAT ORU and Thermochemistry Facility, University of California at Davis, California, 95646-8779, Davis, USA

    Theresa A. Lee & Alexandra Navrotsky

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  1. Theresa A. Lee
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  2. Alexandra Navrotsky
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Correspondence to Alexandra Navrotsky.

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Lee, T.A., Navrotsky, A. Enthalpy of formation of cubic yttria-stabilized hafnia. Journal of Materials Research 19, 1855–1861 (2004). https://doi.org/10.1557/JMR.2004.0234

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