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.
Original language | English (US) |
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Pages (from-to) | 1629-1638 |
Number of pages | 10 |
Journal | Journal of the European Ceramic Society |
Volume | 41 |
Issue number | 2 |
DOIs | |
State | Published - Feb 2021 |
Keywords
- Calorimetry
- Oxide materials
- Synchrotron radiation
- Thermal analysis
- Thermodynamic properties
- YTaO
- Yttrium tantalate
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry