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Report No.

Thermal conductivities of hypostoichiometric (U, Pu, Am)O$$_{2-x}$$ oxide

Morimoto, Kyoichi ; Kato, Masato   ; Ogasawara, Masahiro*; Kashimura, Motoaki

The thermal conductivities of (U$$_{0.68}$$Pu$$_{0.3}$$Am$$_{0.02}$$)O$$_{2-x}$$ solid solutions (x = 0.0 - 0.1) were studied at temperatures from 900 to 1773 K. Thermal conductivities were obtained from the thermal diffusivity measured by laser flash method. The thermal conductivities obtained experimentally up to about 1400K could be expressed by a classical phonon transport model, $$lambda$$ = (A+BT)$$^{-1}$$, A(x) = 2.89$$times$$x + 2.24$$times$$10$$^{-2}$$ (m K/W) and B(x) = (- 6.70$$times$$x + 2.48) $$times$$ 10$$^{-4}$$ (m/W). The experimental values of A showed a good agreement with theoretical predictions. The experimental values of B could be fairly expressed by the theoretical prediction in the region x $$<$$ 0.04, but not deviated from the ones in the region x $$>$$ 0.04. Although this reason could not be understood well, it is most likely that the uncertainty in the measurement of melting temperature cause this difference.



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Category:Materials Science, Multidisciplinary



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