An isotope effect upon the internal mobility of the Dy ion was measured, at temperatures ranging from 973 to 1073K, by using a counter-current electromigration technique. It was found that heavier Dy isotopes were enriched around the anode. The mass effect was defined by: uMDy/MuDy, where u was the difference in mobility for mass number, M (= 160, 161, l63 or 164) with respect to a mass number of 162. The magnitude of the mass effect was calculated to be equal to -0.032. A comparison of this value with previously determined data for other molten metal chloride systems suggested that the principal conducting Dy species was the trivalent cation.

H.Matsuura, I.Okada, M.Nomura, M.Okamoto, Y.Iwadate: Journal of the Electrochemical Society, 1996, 143[12], 3830-5