CONDUCTIVITY AND CREEP IN ACCEPTOR-DOMINATED POLYCRYSTALLINE Al2O3.

Article abstract of DOI:10.1007/BF00551027

Ionic and electronic conductivity and compressive creep of hot-pressed polycrystalline acceptor-dominated Al//2O//3 were measured as a function of oxygen partial pressure and grain size varying from 3 to 200 mu m. Hole conduction shows a slight preference for grain-boundaries; ionic conduction is slightly hindered by grain boundaries, indicating that fast oxygen grain-boundary diffusion involving charged species does not occur. Conductivity and creep are accounted for on the basis of a model in which there is fast grain-boundary migration by a neutral oxygen species.