Abstract
Abstract The extremely high thermal vacancy concentrations that occur in the intermetallic compound CoGa, have allowed us to study vacancy mobility, by measuring the length increase as a function of time, due to the formation of thermal vacancies. By application of this technique vacancy formation and migration can be studied simultaneously. From the temperature dependence of the defect mobilities it is concluded that at least two processes for vacancy migration are present. An interpretation in terms of different types of atomic jumps is presented. In combination with results of vacancy concentration measurements a comparison with self-diffusion measurements is made. From a combination of these results with the present ones, a simple diffusion model is proposed in which only one type of atomic jump for each component is involved. Finally, for one of the atomic jump types, vacancy migration enthalpies are derived.
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