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2023
ACL
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D.Krishnan, M.Korenko, F.Šimko, B.Kubíková, A.Rakhmatullin, 'Thermal Analysis and Phase Equilibria of the Molten System Na3AlF6-NdF3-Nd2O3', The Journal of The Minerals, Metals & Materials Society (TMS) (2023) doi:10.1007/s11837-023-06087-9
Phase diagrams of the systems Na3AlF6-NdF3 and (Na3AlF6-NdF3)eut-Nd2O3 were experimentally determined by thermal analysis up to 60 mol.% NdF3 and 45 mol.% Nd2O3, respectively. The Na3AlF6-NdF3 system was found to be a simple eutectic system with the eutectic point with the following approximate coordinates: 49 mol.% NdF3 and 905°C. This eutectic composition was then used for the thermal analysis of the (Na3AlF6-NdF3)eut-Nd2O3 system. The coordinates of the eutectic point of the (Na3AlF6-NdF3)eut-Nd2O3 system were found to be approximately 46 mol.% Nd2O3 and 733°C. After the thermal analysis, the x-ray diffraction analysis of the solidified samples of both systems was performed. The XRD analysis of the Na3AlF6-NdF3 system has shown the formation of two new compounds; NaNdF4 and NdOF. The formation of NdOF is probably the product of the high-temperature hydrolysis between the moisture in the atmosphere and NdF3. The XRD analysis of the solidified samples of the (Na3AlF6-NdF3)eut-Nd2O3 system has shown the formation of the following new compounds: NaNdF4, NdOF, NdAlO3, and NaF.
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