The diffusion coefficients of Li+ ions in the melt were determined, by using the capillary reservoir method, at temperatures ranging from the melting point upwards. There was a close correlation between the apparent activation energy for solute diffusion, and the heat of mixing of solute and solvent salts at infinite dilution. It was found that the data for temperatures ranging from 665 to 870C could be described by:

D (cm2/s) = 1.13 x 10-3 exp[-6.15(kcal/mol)/RT]

Diffusion of Li+ Ion in Molten NaCl, KCl and CsCl and Na+, Rb+ and Cs+ Ions in Molten CsCl. T.Ejima, T.Yamamura, H.Hisamoto: Journal of the Japan Institute of Metals, 1977, 41[7], 742-9

 

Table 50

Diffusivity of Ni Ions in Molten CsCl

 

Temperature (C)

NiCl2 (/cm3)

D (cm2/s)

705

2.62 x 105

1.44 x 10-5

705

2.72 x 105

1.50 x 10-5

705

2.83 x 105

1.67 x 10-5

805

2.61 x 105

2.22 x 10-5

805

2.62 x 105

2.00 x 10-5

805

3.48 x 105

2.03 x 10-5