Фазовая диаграмма системы Li-Na

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Li-Na (Lithium-Sodium) C.W. Bale Li-Na is a simple system that exhibits extensive immiscibility in both the liquid and solid states. The liquid-liquid region in the assessed phase diagram was taken primarily from [75Fei], because the diagram of [75Fei] has a much lower critical temperature than that reported by [Elliott] and [Hansen]. The work of [56Sal], [68Kan], and [71Sch] was also reviewed in constructing the present diagram. The solidus lines were calculated from thermodynamic principles. The diagram is similar to those of the K-Li, Li-Rb, and Cs-Li systems. Among the Li-alkali systems, one would expect the extent of immiscibility to be the least pronounced in the Li-Na system, because Li and Na have the two smallest alkali atomic diameters. Thermodynamic calculation places the critical point at 303.2 C and 35.7 at.% Na and above 302 C in the range of 29 to 43 at.% Na. The monotectic temperature is fairly well established at about 170.7 C. In general, monotectic L1 and L2 compositions are difficult to measure by equilibration and chemical analysis techniques, because contamination of the liquid phases and interference from the solid (Li) are difficult to avoid. 56Sal: O.N. Salmon and D.H. Ahmann, J. Phys. Chem.,60, 13 (1956). 68Kan: F.A. Kanda, R.C. Faxon, and D.V. Keller, Phys. Chem. Liquids, 1, 61-73 ( 1968). 71Sch: H.K. Schurmann and R.D. Parks, Phys. Rev. Lett., 27, 1790-1793 (1971). 75Fei: P.D. Feitsma, J.J. Hallers, F.V.D. Werff, and W. Van der Lugt, Physica, 79B, 35-52 (1975). Published in Bull. Alloy Phase Diagrams, 10(3), Jun 1989. Complete evaluation contains 4 tables, 1 figure, and 17 references. 1