Abstract
Mass transport through the bulk of ionic materials is a relatively mature subject and understanding of the fundamental processes is well advanced. In contrast, mass transport at surfaces and interfaces in ionic materials is poorly understood. Often the basic phenomenology is not well-established and conflicting results are reported by different workers. This contribution attempts to review the current state of knowledge in this field, mainly for materials in which surface and interfacial diffusion are more rapid than bulk diffusion. Both theoretical and experimental studies indicate that fast diffusion at surfaces and interfaces occurs by point defects which are similar to lattice point defects, but have energies of formation and migration which are lower than the corresponding lattice defects.
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