Role of vacancy anharmonicity on non-Arrhenius diffusional behavior
- 15 June 1975
- journal article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 11 (12) , 4916-4926
- https://doi.org/10.1103/physrevb.11.4916
Abstract
Curvature in the Arrhenius plot of self-diffusion, usually attributed to the coexistence of two or more separate mobile defects, is shown to be explainable in terms of a single highly relaxed vacancylike defect, in which the anharmonicity of the lattice modes gives rise to a large thermal-expansion coefficient for the defect. A model based on this approach gives excellent agreement for all cases in which curvature has been observed, as well as for others in which no curvature has been detected.Keywords
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