Chronopotentiometry was used to study the diffusion of Th4+ in KCl-NaCl melts which contained ThCl4 or ThF4. The results (table 102) showed that the addition of F ions to the electrolyte resulted in a decrease in the diffusivity of Th4+. This was related to a strengthening of the bonds between the Th and F ions, and a corresponding decrease in the mobility of the ions.

Y.P.Kanashin, V.P.Butorov, E.A.Novikov, I.F.Nichkov, S.P.Raspopin: Elektrokhimiya, 1972, 8[1], 73-4

 

 

Table 102

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