Abstract
In the frame of minor actinide recycling, (U,Am)O2 are promising transmutation targets. To assess the thermodynamic properties of the U-Am-O system, it is essential to have a thorough knowledge of the binary phase diagrams, which is difficult due to the lack of thermodynamic data on the Am-O system. Nevertheless, an Am-O phase diagram modelling has been recently proposed by Gotcu. Here, we show a recent investigation of the Am-O system using in-situ High Temperature X-ray Diffraction under controlled atmosphere. By coupling our experimental results with the thermodynamic calculations based on the Gotcu model, we propose for the first time a relation between the lattice parameter and the departure from stoichiometry.
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Epifano, E., Belin, R.C., Richaud, J.C. et al. In-situ High Temperature X-ray Diffraction Study of the Am-O System. MRS Advances 1, 4133–4137 (2016). https://doi.org/10.1557/adv.2017.200
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DOI: https://doi.org/10.1557/adv.2017.200