The surface self-diffusion of silver on specific crystallographic surfaces of silver single crystals and on polycrystalline specimens was investigated. Various methods of surface preparation were used and the general conclusion was reached that surface diffusion is accelerated during changes of surface shape. The theory is advanced that "surface" diffusion takes place by a lattice vacancy mechanism; an abnormally high concentration of lattice vacancies is believed to be necessary for changes of surface shape to occur. This accounts for the accelerated surface diffusion observed under these conditions.
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Winegard et al. (1952) studied this question.
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