Oxygen potentials of (U $_{0.685}$ ,Pu $_{0.270}$ ,Am $_{0.045}$ )O $_{2-x}$ solid solutions

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

Oxygen potentials of (U,Pu)O $_{2-x}$ containing AmO $_{2-x}$ , (U $_{0.685}$ Pu $_{0.270}$ Am $_{0.045}$ )O $_{2-x}$ , were measured as functions of the oxygen to metal (O/M) ratios and temperatures by hermogravimetric analysis (TGA) and discussed from thermodynamic viewpoints. The (U $_{0.685}$ Pu $_{0.270}$ Am $_{0.045}$ )O $_{2-x}$ solid solution was prepared by a traditional powder metallurgical route. Oxygen partial pressure (pO $_{2}$ ) was adjusted in the region from 10 $^{-22}$ to 10 $^{-8}$ MPa by using CO $_{2}$ /H $_{2}$ and H $_{2}$ O /H $_{2}$ equilibria. Changes of microgram order in the specimen weight were continuously monitored with a TGA apparatus and the dependences of oxygen potentials on the O/M ratios were obtained at 1123K, 1273K and 1423K. The oxygen potentials of (U $_{0.685}$ Pu $_{0.270}$ Am $_{0.045}$ )O $_{2-x}$ were significantly higher than those in (U $_{0.7}$ Pu $_{0.3}$ )O $_{2-x}$ . The partial molar entropy and enthalpy of oxygen have been calculated and compared with those of Am O $_{2-x}$ , (Am $_{0.05}$ U $_{0.05}$ ) O $_{2-x}$ , and (U $_{0.7}$ Pu $_{0.3}$ )O $_{2-x}$ . Finally, the oxygen potential isotherms of (U $_{0.685}$ ,Pu $_{0.270}$ ,Am $_{0.045}$ )O $_{2-x}$ were examined in terms of defect structure.

Language	:	English
Journal	:	Journal of Alloys and Compounds
Volume	:	397
Number	:	1-2
Pages	:	p.110 - 114
Publication Year/Month	:	2005/07
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Paper URL	:	https://doi.org/10.1016/j.jallcom.2005.01.024
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Keywords	:	no keyword
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Registration No. : 09-2004-0314
JAEA Abstracts No. :
Paper Submission No. : 1243

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Oxygen potentials of (U,Pu,Am)O solid solutions

Oxygen potentials of (U $_{0.685}$ ,Pu $_{0.270}$ ,Am $_{0.045}$ )O $_{2-x}$ solid solutions