The diffusivity of 88Y3+ was studied (table 138). Theoretical equations for transport processes, in alkali halides doped with a trivalent cation, were derived from the theory of crystals doped with divalent cations. The jump frequency of Y3+ was given by f(/s) = 1.37 x 1013exp[-0.98(eV)/kT].

Transport Processes in NaCl Single Crystals Doped with a Trivalent Cation; Solubility, Association and Migration of Y3+. F.Bénière, R.Rokbani: Journal of Physics and Chemistry of Solids, 1975, 36[11], 1151-60