DataVXJOMPaper
journal article·2024-03Open access

Thermal Analysis and Phase Equilibria of the Molten System Na3AlF6-NdF3-Nd2O3

Dhiya Krishnan, Michal Korenko, František Šimko, Blanka Kubíková, Aydar Rakhmatullin

JOM· Volume 76· Issue 3
Publisher pageOpen full text
Source abstract

Abstract

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.
Source: crossref · Quality: baseline

Research context

OpenAlex topics: Inorganic Fluorides and Related Compounds · Molten salt chemistry and electrochemical processes · Extraction and Separation Processes

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

References (22)

Show source-provided references
1. K. Grjotheim, H. Kvande, L. Qingfeng, and Q. Zhuxian, Metal Production by Molten Salt Electrolysis: Especially Aluminium and Magnesium (China University of Mining and Technology Press, Xuzhou, 1998).
2. G.D. Lovering, Molten Salt Technology (Plenum Press, New York, 1982).10.1007/978-1-4757-1724-2 ↗
3. J. Thonstad, P. Fellner, G.M. Haarberg, J. Híveš, H. Kvande, and Å. Sterten, Aluminium Electrolysis, 3rd edn. (Aluminium – Verlag, Duesseldorf, 2001).
4. L.E. McNeese, Program of Development of Molten-Salt Breeder Reactors (Oak Ridge National Laboratory, ORNL-5018, 1974).10.2172/4227904 ↗
5. A.K. Misra and J.D. Whittenberger, Fluoride Salts and Container Materials for Thermal Energy Storage Applications in the Temperature Range 973 to 1400 K (National Aeronautics and Space Administration, NASA Lewis Technical Memorandum 89913, AIAA-87-9226, 1987).10.2514/6.1987-9226 ↗
6. C.W. Forsberg, P.F. Peterson, and H. Zhao, J. Sol. Energy Eng. 129, 141 (2007).10.1115/1.2710245 ↗
7. N. Krishnamurty and C.K. Gupta, Extractive Metallurgy of Rare Earth, 2nd edn. (CRC Press, Boca Raton, 2016).
8. G. Charalampides, K.I. Vatalis, B. Apostoplos, and B. Ploutarch-Nikolas, Procedia Econ. Financ. 24, 126 (2015).10.1016/S2212-5671(15)00630-9 ↗
9. V. Balaram, Geosci. Front. 10, 1285 (2019).10.1016/j.gsf.2018.12.005 ↗
10. L. Ciacci, I. Vassura, Zh. Cao, G. Liu, and F. Passarini, Resour. Conserv. Recycl. 142, 143 (2019).10.1016/j.resconrec.2018.11.024 ↗
11. I.B. De Lima and W.L. Filho, Rare Earths Industry; Technological, Economic, and Environmental Implications (Elsevier, 2016), pp 223–234.
12. K. Grjotheim, C. Krohn, M. Malinovský, K. Matiašovský, and J. Thonstad, Aluminium Electrolysis, 2nd edn. (Aluminium – Verlag, Duesseldorf, 1982).
13. S.I. Berul and N.K. Voskresenskaya, Zh. Neorg. Khim. 8, 1431 (1963) (Russ.). Cited according to M. Ambrová, J. Jurišová, V. Danielik, and J. Gabčová, J. Therm. Anal. Calorim. 91, 569 (2008).10.1007/s10973-007-8533-6 ↗
14. A. Abbasalizadeh, A. Malfliet, S. Seetharaman, J. Sietsma, and Y. Yang, J. Sustain. Metall. 3, 627 (2017).10.1007/s40831-017-0120-x ↗
15. X. Guo, Zh. Sun, J. Sietsma, and Y. Yang, Ind. Eng. Chem. Res. 55, 4773 (2016).10.1021/acs.iecr.5b04892 ↗
16. D. Bratland, Light Met. 1, 183 (1976).
17. E. Morrice and R.G. Reddy, Rare Earths; Extraction, Preparation and Applications, ed. R.G. Bautista, M.M. Wong (TMS, Las Vegas, 1989), p. 377.
18. S. Du, M. Wu, F. Du, and Z. Liu, Chin. Rare Earths 8(2), 59 (1987).
19. M. Ambrová and J. Jurišová, Thermochim. Acta 443, 105 (2006).10.1016/j.tca.2006.01.007 ↗
20. V. Daněk, Physico-chemical Analysis of Molten Electrolytes (Elsevier, Amsterdam, 2006).
21. A. Sterten and I. Mæland, Acta Chem. Scand. A39, 241 (1985).10.3891/acta.chem.scand.39a-0241 ↗
22. L.R. Batsanova and N.V. Podberezskaya, Russ. J. Inorg. Chem., 5, 534 (1966) (Russ). Cited according to J.M. Juneja, A.K. Tyagi, G. Chattopadhyay, and S. Seetharaman, Mater. Res. Bull., 30(9), 1153 (1995).10.1016/0025-5408(95)00100-X ↗