Simulation of diffusion of oxygen and uranium in uranium dioxide nanocrystals

被引：34

作者：

Kupryazhkin, A. Ya. ^{[1
]}

Zhiganov, A. N. ^{[1
]}

Risovany, D. V. ^{[1
]}

Nekrassov, K. A. ^{[1
]}

Risovany, V. D. ^{[2
]}

Golovanov, V. N. ^{[2
]}

机构：

[1] Ural State Tech Univ, Ekaterinburg 620002, Russia

[2] Res Inst Atom Reactors, Ulyanovsk Region 433510, Russia

来源：

JOURNAL OF NUCLEAR MATERIALS | 2008年 / 372卷 / 2-3期

关键词：

D O I：

10.1016/j.jnucmat.2007.03.176

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The method of molecular dynamics is used to study phase transitions and ion transport phenomena in uranium dioxide nanocrystals. The temperature dependences of uranium and oxygen diffusion coefficients in the range from 2280 to 3950 K are calculated separately for surface, near-surface and bulk regions of the crystals. On these dependences we have distinguished temperature intervals, which correspond to crystalline phase, superionic state and melt. The activation energies of diffusion and pre-exponential factors for these intervals are determined. The obtained results are compared with experimental data and calculations of other authors. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：233 / 238

页数：6

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