Oxygen Surface Exchange and Tracer Diffusion in Differently Oriented Thin Films of Gd-Doped CeO.

The exchange of O between gaseous molecular oxygen and thin-film samples of CeGdO with two different, nominal surface orientations [(111) and (110)] was studied. Oxygen isotope exchange experiments were conducted in the temperature range of 573 ≤ /K ≤ 673 at an oxygen activity of O = 0.2.

Computational Study of Oxygen Diffusion along a[100] Dislocations in the Perovskite Oxide SrTiO3.

We used classical molecular-dynamics simulations to study the atomistic structure of, and the diffusion of oxygen ions along, the periodic array of edge dislocations comprising a symmetrical 6.0° [100] tilt grain boundary in SrTiO3. The results indicate that, at elevated temperatures, the two types of dislocation core (TiO2-type and SrO-type) that make up the boundary are stable and that oxygen-deficient cores maintain their dissociated structures.