Energetics of a Uranothorite (Th1–xUxSiO4) Solid Solution
Source abstract
Abstract
High-temperature oxide melt solution calorimetric measurements were completed to determine the enthalpies of formation of the uranothorite, (USiO 4 ) x –(ThSiO 4 ) 1– x, solid solution. Phase-pure samples with x values of 0, 0.11, 0.21, 0.35, 0.71, and 0.84 were prepared, purified, and characterized by powder X-ray diffraction, electron probe microanalysis, thermogravimetric analysis and differential scanning calorimetry coupled with in situ mass spectrometry, and high-temperature oxide melt solution calorimetry. This work confirms the energetic metastability of coffinite, USiO 4, and U-rich intermediate silicate phases with respect to a mixture of binary oxides. However, variations in unit cell parameters and negative excess volumes of mixing, coupled with strongly exothermic enthalpies of mixing in the solid solution, suggest short-range cation ordering that can stabilize intermediate compositions, especially near x = 0.5.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Nuclear materials and radiation effects · Radioactive element chemistry and processing · Nuclear Materials and Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
Peter A. Rock Thermochemistry Laboratory and NEAT ORU, University of California at Davis, Davis, California 95616, United States
Institut de Chimie Séparative de Marcoule, ICSM-UMR 5257, CNRS/CEA/University of Montpellier/ENSCM, Site de Marcoule-Bât. 426, BP 17171, 30207 Bagnols sur Cèze cédex, France
CEA, Nuclear Energy Division, Radiochemistry & Processes Department, BP 17171, 30207 Bagnols sur Cèze, France
The Gene and Linda Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, Washington 99163, United States
Department of Geological Sciences, Stanford University, Stanford, California 94305, United States
Funding
Laboratory Directed Research and Development
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