Diffusion coefficient of La(III) and Nd(III) measured by chronopotentiometry in molten LiCl-KCl eutectic

The electrochemical behaviours of lanthanum and neodymium were investigated in a molten LiCl-KCl eutectic by chronopotentiometry. A chronopotentiometric method was devised to minimize the error in defining the surface area of the working electrode. The immersed depth of the working electrode was altered in stages, and the relation between the change in the square root of the transition time and that of the surface area of the working electrode was substituted for the Sand equation using-their absolute values. The diffusion coefficients of La(III) and Nd(III) were determined in the temperature range between 673 and 823 K and the validity of the Arrhenius law was also verified by plotting the variation in the logarithm of the diffusion coefficient versus the inverse of the temperature.