Role of vacancy anharmonicity on non-Arrhenius diffusional behavior
Role of vacancy anharmonicity on non-Arrhenius diffusional behavior
复制标题
空位非谐性对非阿累尼乌斯扩散行为的作用
DOI：
10.1103/physrevb.11.4916
复制
发表时间：
1975
影响因子：
3.7
通讯作者：
D. Lazarus
中科院分区：
文献类型：
--
作者：
H. M. Gilder;D. Lazarus
Arrhenius自扩散图中的曲率通常归因于两个或多个独立的运动缺陷的共存，它可以用单个高度松弛的类空位缺陷来解释，其中晶格模的非谐性导致了缺陷的大的热膨胀系数。基于这种方法的模型对于所有观察到曲率的情况以及没有检测到曲率的其他情况都有很好的一致性。
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.