Diffusion of helium in non-stoichiometric uranium dioxide

被引：30
|
作者：
Yakub, E. [1 ]
Ronchi, C. [2 ]
Staicu, D. [2 ]
机构：
[1] Odessa State Econ Univ, Cybernet Dept, UA-65082 Odessa, Ukraine
[2] Commiss European Communities, Joint Res Ctr, Inst Transuranium Elements, D-76125 Karlsruhe, Germany
来源：
JOURNAL OF NUCLEAR MATERIALS | 2010年 / 400卷 / 03期
关键词：
UO2; HE; SIMULATION; MIGRATION; BEHAVIOR;
D O I：
10.1016/j.jnucmat.2010.03.002
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Diffusion coefficients of helium in solid UO(2+x) at high temperature and various stoichiometric compositions are evaluated by using molecular dynamics simulations based on a partly-ionic model in conjunction with a polaron 'Free Hopping Approximation' proposed earlier. The results are compared with existing experimental and simulation data. A strong dependence of the apparent diffusion activation energy on stoichiometry is found and the mechanisms of He migration in non-stoichiometric solid UO(2+x). are discussed. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码：189 / 195
页数：7
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