The self-diffusion of Na+ and Cs+ ions in the hydrous oxide was studied at temperatures of 25, 42, 50 and 57C. The conditions were designed to favor only a particle diffusion mechanism, and the self-diffusion coefficients (table 22) were determined by using the Paterson approximation. The activation energies, entropies and free energies of activation were calculated, and a tentative model for alkali ion transport in this oxide was developed.

K.Benyamin: Solid State Ionics, 1994, 73[3-4], 303-8

Table 22

Diffusivity of Cs and Na in TiO2