A Combined Experimental and Computational Thermodynamic Investigation of the U-Th-O System
| Autor: | Theodore M. Besmann, Stewart L Voit, Jacob W. McMurray |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Thermogravimetric analysis Chemical substance Materials science Thermodynamics Ionic bonding Nanotechnology 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Fluorite Thermogravimetry 0103 physical sciences Materials Chemistry Ceramics and Composites 0210 nano-technology Science technology and society Ternary operation CALPHAD |
| Zdroj: | Journal of the American Ceramic Society. 99:2197-2209 |
| ISSN: | 0002-7820 |
| DOI: | 10.1111/jace.14180 |
| Popis: | Here, the thermodynamics of the U–Th–O system have been assessed using the Calphad method. The compound energy formalism (CEF) and a partially ionic two-sublattice liquid model (TSLM) were used for the fluorite U1–yThyO2±x, γ-(U,Th)4O9, and the U–Th–O melt. The O2 activity of fluorite U1–yThyO2±x with temperature and composition was determined by thermogravimetric analysis. Thermodynamic studies for the Th–O binary and U–Th–O ternary available in the open literature were critically reviewed. A self-consistent data set was selected and compiled with the equilibrium oxygen pressures determined by thermogravimetry in order to optimize the adjustable parameters of models selected to represent the phases in the Th–O and U–Th–O systems. |
| Databáze: | OpenAIRE |
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