Thermochemistry and phase stability of the polymorphs of yttrium tantalate, YTaO4

Lepple M, Ushakov SV, Lilova K, Macauley C, Fernandez AN, Levi CG, Navrotsky A (2020)


Publication Type: Journal article

Publication year: 2020

Journal

DOI: 10.1016/j.jeurceramsoc.2020.10.039

Abstract

Thermodynamic parameters of the three fergusonite-related polymorphs M’, M and T of YTaO4 and their phase stabilities were investigated experimentally. The debate on the relative stability of the M and M’ phases was resolved, and it was shown that the compound does not transform to a cubic polymorph prior to melting. The enthalpies of formation of M and M’ were determined using high temperature oxide melt solution calorimetry, and the heat capacities and heat contents were measured. The enthalpy of the M’ to T phase transition was measured by differential thermal analysis. The stability of the T phase up to its melting at 2090 °C was demonstrated using high temperature X-ray diffraction and thermal analysis. Its enthalpy of fusion was determined using drop-and-catch calorimetry. The thermodynamic properties of YTaO4 assessed in this study enable the thermodynamic modeling of its polymorphs and related materials systems of technological importance.

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How to cite

APA:

Lepple, M., Ushakov, S.V., Lilova, K., Macauley, C., Fernandez, A.N., Levi, C.G., & Navrotsky, A. (2020). Thermochemistry and phase stability of the polymorphs of yttrium tantalate, YTaO4. Journal of the European Ceramic Society. https://dx.doi.org/10.1016/j.jeurceramsoc.2020.10.039

MLA:

Lepple, Maren, et al. "Thermochemistry and phase stability of the polymorphs of yttrium tantalate, YTaO4." Journal of the European Ceramic Society (2020).

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