Chronopotentiometric methods were used to investigate the diffusion of Nb2+ and Nb3+ in equimolecular KCl-NaCl melts. The diffusivity of Nb3+ (0.9 to 1.7%Nb), at temperatures of 700 to 840C, could be described by: D (cm2/s) = 4.36 x 10-3 exp[-10.5(kcal/mol)/RT]

The diffusivity of Nb2+ could be described by:

D (cm2/s) = 9.2 x 10-3 exp[-9.15(kcal/mol)/RT]

Diffusion Coefficients of Nb Ions in KCl-LiCl and NaCl-KCl Molten Salt Mixtures. V.F.Pimenov, Y.V.Baimakov: Electrokhimiya, 1968, 4[11], 1357-60

 

Table 86

Diffusivity of Th in KCl-NaCl Melts

 

Addition

Temperature (C)

D (cm2/s)

Q (kJ/mol)

ThCl4

700

2.38 x 10-5

53.42

ThCl4

800

4.39 x 10-5

53.42

ThF4

700

1.62 x 10-5

66.48

ThF4

800

3.49 x 10-5

66.48