Measurement of oxygen chemical diffusion in PuO2-x and analysis of oxygen diffusion in PuO2-x and (Pu, U)O2-x

被引：5
|
作者：
Kato, Masato [1 ]
Uchida, Teppei [1 ]
Sunaoshi, Takeo
机构：
[1] Japan Atom Energy Agcy, Adv Nucl Syst Res & Dev Directorate, Tokai, Ibaraki 3191194, Japan
来源：
PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 10, NO 2 | 2013年 / 10卷 / 02期
关键词：
PuO2; oxygen diffusion; oxygen vacancy; oxygen potential;
D O I：
10.1002/pssc.201200454
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Oxygen chemical diffusion in PuO2-x was investigated in the temperature range of 1473-1873 K by thermogravimetry as functions of oxygen-to-metal (O/M) ratios and temperatures. The oxygen chemical diffusion coefficients, (D) over tilde, were determined assuming that the reduction curves were dominated by a diffusion process. The O/M ratio and Pu content dependence on the chemical diffusion coefficients were evaluated. The chemical diffusion coefficient had its minimum value at around O/M=1.98 and decreased with increasing Pu content in (U, Pu)O2-x. The self-diffusion coefficients were evaluated. A model for describing the relationship among O/M ratio, oxygen chemical diffusion, and self-diffusion was proposed based on defect chemistry. (C) 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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页码：189 / 192
页数：4
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