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

页码：189 / 195

页数：7

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