日本金属学会誌

J. Japan Inst. Metals, Vol. 39, No. 4 (1975),
pp. 409-413

Diffusion of Alkali Metal Ions in Molten Lithium Chloride

Tatsuhiko Ejima1, Tsutomu Yamamura1, Yoji Arita2 and Katsuyuki Matsui3

1Department of Metallurgy, Faculty of Engineering, Tohoku University, Sendai
2Graduate School, Tohoku University, Sendai. Present address: Mitsubishi Chemical Industries, Ltd., Tokyo
3Department of Metallurgy, Faculty of Engineering, Isuzu Motors Ltd., Tokyo

Abstract:

Diffusion coefficients of 22Na, 86Rb and 137Cs ions have been determined in molten lithium chloride by using the capillary reservoir method in the temperature range of 650 ∼ 820°C.
The results obtained are summarized as follows:
(1) Diffusion coefficients determined were in the order of DNa>DRb>DCs. There is a large difference in the diffusion coefficients of each ions in molten lithium chloride as compared with the cases of sodium and potassium chlorides. Since the hole size of molten lithium chloride is comparable to the size of cations, the diffusion coefficients are largely affected by the size of diffusing particle. This trend becomes less in the cases of sodium and potassium chlorides.
(2) The activation energy for diffusion tends to decrease with increasing enthalpy of mixing at infinite dilution in molten LiCl, NaCl and KCl. This trend may be explained in terms of the interaction energy between solute and solvent ions, particularly by the polarization energy and the London energy.


(Received 1974/10/26)

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