Chemical thermodynamic representation of (U,Pu,Am)O $_{2-x}$

Osaka, Masahiko ; Namekawa, Takashi; Kurosaki, Ken*; Yamanaka, Shinsuke*

The oxygen potential isotherms of (U,Pu,Am)O $_{2-x}$ were represented by a chemical thermodynamic model proposed by Lindemer et al. It was assumed in the present model that (U,Pu,Am)O $_{2-x}$ consisted of the chemical species PuO $_{2}$ , Pu $_{4/3}$ O $_{2}$ , AmO $_{2}$ , Am $_{5/4}$ O $_{2}$ and UO $_{2}$ in a pseudo-quaternary system by treating the reduction rates of Pu and Am as identical; furthermore an interaction between Am $_{5/4}$ O $_{2}$ and UO $_{2}$ was introduced. The agreement between analytical and experimental isotherms was good, but the analytical values slightly overestimated the experimental values especially in the case of lower Am content. Adding an interaction between Am $_{5/4}$ O $_{2}$ and PuO $_{2}$ to the model resulted in a better representation.

Language	:	English
Journal	:	Journal of Nuclear Materials
Volume	:	344
Number	:	1-3
Pages	:	p.230 - 234
Publication Year/Month	:	2005/09
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Paper URL	:	https://doi.org/10.1016/j.jnucmat.2005.04.047 Read or search this article
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Registration No. : 09-2004-0444
JAEA Abstracts No. : 34001096
Paper Submission No. : 1247

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