The diffusivity of Ti was measured by using a chronogalvanometric method which involved monitoring the decrease in current density following the moment at which the potential corresponding to the peak on the polarization curve was applied to the cathode. It was found that there was a sharp increase in the diffusion coefficients at 520 and 560C in melts which contained more than 33mol%MgCl2. This point on the composition axis corresponded to a change in the activation value from 60 to 30kJ/mol (table 111). This change was attributed to the effect of complex formation in the melt. The activation energy for the diffusion of Ti in a melt containing more than 33mol%MgCl2 was close to that for viscous flow in the melt.

Diffusion of Titanium Ions in Chloride Electrolytes. V.S.Balikhin, S.B.Makarov: Elektrokhimiya, 1984, 20[5], 696-9 (Soviet Electrochemistry, 1984, 20[5], 652-4)