Effect of grain-boundaries on uranium and oxygen diffusion in polycrystalline UO2

被引：44

作者：

Sabioni, ACS ^{[1
]}

Ferraz, WB

Millot, F

机构：

[1] Univ Fed Ouro Preto, Dept Fis, ICEB, BR-35400000 Ouro Preto, MG, Brazil

[2] Ctr Desenvolvimento Tecnol Nucl, CNEN, BR-30161970 Belo Horizonte, MG, Brazil

[3] CNRS, Ctr Rech Mat Haute Temp, F-47071 Orleans, France

来源：

JOURNAL OF NUCLEAR MATERIALS | 2000年 / 278卷 / 2-3期

关键词：

Diffusion in solids - Grain boundaries - High temperature effects - Hydrogen - Nitrogen - Polycrystalline materials - Protective atmospheres - Single crystals - Water;

D O I：

10.1016/S0022-3115(99)00250-0

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The influence of grain-boundaries on uranium and oxygen diffusion in polycrystalline UO2 has been investigated. Our results show that between 1498 degrees C and 1697 degrees C, in H-2 atmosphere, uranium diffusion in UO2 grain-boundaries is about five orders of magnitude greater than uranium volume diffusion, in the same experimental conditions. Between 605 degrees C and 750 degrees C, in H-2/B-2/H2O atmosphere, the oxygen diffusion coefficients measured in polycrystalline and single crystalline UO2 are similar, and correspond to the volume diffusion. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：364 / 369

页数：6

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