2016-Sustainable Industrial Processing Summit
SIPS 2016 Volume 9: Molten Salts and Ionic Liquids, Energy Production
| Editors: | Kongoli F, Gaune-Escard M, Turna T, Mauntz M, Dodds H.L. |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2016 |
| Pages: | 390 pages |
| ISBN: | 978-1-987820-24-9 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Eutectic melt properties in the subsystem LiF-NaF-NaNdF4 of the fluoride system Li,Na,Nd||F
Vasily Lutsyk1; Anna Zelenaya1; Anatoliy Omel'chuk2; Nataliya Faidyuk3; Ruslan Savchuk4;1INSTITUTE OF PHYSICAL MATERIALS SCIENCE SB RAS, Ulan-Ude, Russian Federation; 2UKRAINIAN NATIONAL ACADEMY OF SCIENCES V.I.VERNADSKY INSTITUTE OF GENERAL & INORGANIC CHEMISTRY, Kyiv-142, Ukraine; 3V.I. VERNADSKIY INSTITUTE OF GENERAL & INORGANIC CHEMISTRY OF NATIONAL ACADEMY OF SCIENCES, Kiev, Ukraine; 4V.I. VERNADSKIY INSTITUTE OF GENERAL & INORGANIC CHEMISTRY OF THE NATIONAL ACADEMY OF SCIENCES, Kiev, Ukraine;
Type of Paper: Regular
Id Paper: 153
Topic: 13
Abstract:
Eutectic melt composition and temperature in the subsystem LiF-NaF-NaNdF4(R2) were found by the isopleths of ternary system Li,Na,Nd||F investigation. Eutectic melt solidifies according to the phase reaction scheme LE->LiF+NaF+R2. Methods of differential thermal and X-ray analysis, as well as the high-temperature x-ray diffractometry, were used. Eutectic melt has been appeared during the salt mixture heating at 580 C and consists of 33 mole % NaF, 53 mole % LiF and 14 mole % NdF3. It resembles the “heterogeneous” liquid and includes the mixtures of microgroupings with the different cationic ratios, where fluoride anions do not form a homogeneous matrix. Analysis of the eutectic melt structure is based on the models derived from data of high-temperature x-ray diffractometry. Modeling of melt structure was solved by the reverse Monte Carlo method. Coordination number ZNd(F)>6 depends on temperature, demonstrating in favor of polyhedron’s spatial inhomogeneity. It is difficult to establish the form of this coordinating polyhedron in the melt because the structural parameters are defined clearly enough. Coordination number ZF(F)~7-8. Neodymium cations do not form locally ordered centres with the attached thereto fluoride polyhedrons containing the atoms of sodium or lithium inside. Within the crystal NdF3 six F-F links have the distances 2,46-2,66 A, and other six F-F links have the distances 3,61-3,89 A. In the crystal NaNdF4 5 RF-F distances are equal 2,82 A and 2 RF-F distances are equal 3,71 A. This work has been performed under the program of fundamental research SB RAS (project 0336-2014-0003) and was partially supported by the Russian Foundation for Basic Research (projects 14-08-00453, 15-43-04304).
References:
[1] D. Ravaine, G. Perera and M. Poulain: Anionic conductivity in fluoride glasses, Solid State Ionic, 9-10 (1983), 631-638.[2] S.V. Kuznetsov, V.V. Osiko, E.A. Tkatchenko and P.P. Fedorov: Inorganic nanofluorides and related nanocomposites, Russian Chemical Reviews, 75 (2006), 1065-108.
[3] V.I. Lutsyk. Analysis of liquidus surface of ternary systems, 1987, Science (In Russian).
[4] V.I. Lutsyk and V.P. Vorob’eva: Relation between the mass-centric coordinates in multicomponent salt systems, Z. Naturforsch A, 63a (2008), 513-518.
[5] R.N. Savchuk, N.V. Faidyuk, A.A. Omel’chuk, V.I. Lutsyk and A.E. Zelenaya: Phase Equilibria in the NaF–LiF–LaF3 System, Russian Journal of Inorganic Chemistry, 59 (2014), 600-605.
[6] V.I. Lutsyk, A.E. Zelenaya and V.V. Savinov: Phase Trajectories in CaO-Al2O3-SiO2 melts, Crystallography Reports, 57 (2012), 71-74.
[7] V.I. Lutsyk, V.P. Vorob'eva and A.E. Zelenaya: 3D Reference Book on the Oxide Systems Space Diagrams as a Tool for Data Mining, Solid State Phenomena, 230 (2015) 51-54.
[8] D.А. Petrov: Necessary and sufficient quantity of sections for the construction of monovariant curves in the ternary and quaternary systems, Russian Journal of Physical Chemistry, 14 (1940) 1498-1508. (In Russian)
[9] M.A. Malinowski: To the investigation method of simple ternary systems with one simple eutectic, Proceedings of the Leningrad Polytechnic Institute, 188 (1957) 90-92. (In Russian)
[10] V.I. Posypayko, А.S. Trunin, А.S. Kosmynin and G.Е. Ster: Projection-thermographic method for investigation of binary and ternary reciprocal systems, Reports of Academy of Sciences USSR, 228 (1976) 911-913. (In Russian)
[11] А.S. Trunin and А.S. Kosmynin: Projection-thermographic method of investigation of heterogeneous equilibria in multicomponent condensed systems, 1977, VINITI (Kuibyshev) 12.04.77, № 1372-77. (In Russian)
[12] А.P. Borisova, Yu.V. Granovsky and I.А. Savich: Determination of copper complex composition with glycyl-leucine by Kiefer-Jones, Factory Laboratory, 34 (1968) 569-571. (In Russian)
[13] L.M. Vasil’ieva, Yu.V. Granovsky, L.N. Komissarova and V.I. Spitsin: Planning for the experiment in study of phase diagrams of two-component systems, Proceedings of Academy of Sciences USSR, Chemical series, (1970) 1482-1485. (In Russian)
[14] J. Wilde. Search Methods extreme, 1967, Nauka.
[15] F.P. Vasil’iev. Lectures on methods of solving extremal problems, 1974, MSU Publ. House (Moscow). (In Russian)
[16] N.N. Vorob’ev. Fibonacci Numbers, 1969, Nauka (Moscow), Chapter 6. (In Russian)
[17] V.I. Lutsyk and G.G. Koscheyev: Construction of liquidus lines of eutectic system Mg(PO3)2-MoO3, 1975, Dep.in Cherkassy branch NIITEKHIM (Donesk) 25.01.1975. № 430-75. (In Russian)
[18] Ya.G. Goroshchenko. Physico-chemical analysis of homogeneous and heterogeneous systems, 1978, Sciences view (Kiev). (In Russian)
[19] Melting diagrams of salt systems, ed by V.I. Posypayko, E.A. Alekseeva, 1977, Metallurgy (Moscow) Vol. 2. (In Russian)
[20] V.E. Sokol’skii, A.S. Roik, A.O. Davidenko, N.V. Faidyuk, and R. N. Savchuk: X-Ray Diffraction Study of the NaF–LiF–NdF3 Eutectic in the Liquid and Solid States, Inorganic Materials 49 (2013) 844-852.