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- Title
Thermal Analysis and Phase Equilibria of the Molten System Na<sub>3</sub>AlF<sub>6</sub>-NdF<sub>3</sub>-Nd<sub>2</sub>O<sub>3</sub>.
- Authors
Krishnan, Dhiya; Korenko, Michal; Šimko, František; Kubíková, Blanka; Rakhmatullin, Aydar
- Abstract
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.
- Subjects
THERMAL analysis; PHASE equilibrium; EUTECTIC reactions; X-ray diffraction; PHASE diagrams; EUTECTICS; MOISTURE
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2024, Vol 76, Issue 3, p1587
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-023-06087-9