Thermal conductivity of uranium-cerium mixed oxide

Hirooka, Shun ; Nelson, A.*; White, J.*; Kato, Masato ; McClellan, K.*

Thermal diffusivity of (U $_{0.7}$ Ce $_{0.3}$ )O $_{2}$ and (U $_{0.8}$ Ce $_{0.2}$ )O $_{2}$ was measured by laser flash method as a function of oxygen-to-metal ratio over the temperature range of 373 K to 1473 K and the thermal conductivity was evaluated. Only stoichiometric data of thermal conductivity of (U,Ce)O $_{2}$ was reported and that was comparable with thermal conductivity obtained in this work. Thermal conductivity was highest at stoichiometry, and was not perfectly symmetric with respect to the stoichiometry but slightly lower for hyper-stoichiometric compositions. The thermal conductivity of (U,Ce)O $_{2}$ showed the trend with temperature to be comparable to that of (U,Pu)O $_{2}$ . However, the thermal resistivity did not follow the linear function of temperature, A+BT, which is an unique characteristics in (U,Ce)O $_{2}$ .

Language	:	English
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Meeting title	:	15th International IUPAC Conference on High Temperature Materials Chemistry (HTMC-15)
Held date	:	2016/03
Location (city)	:	Orlans
Location (country)	:	France
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Keywords	:	Cerium; Thermal Conductivity; oxygen-to-metal ratio
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Cooperating Institute	:	Los Alamos National Laboratory

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Registration No. : BB20152514
JAEA Abstracts No. :
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