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Thermal diffusivity measurement of (U, Pu)O2−x at high temperatures up to 2190 K

Journal of Nuclear Materials
DOI: 10.1016/j.jnucmat.2013.07.048


Abstract The thermal diffusivities of uranium and plutonium mixed oxide (MOX) fuels with 30% Pu-content were measured at temperatures from 990 to 2190K by the laser flash method. In high-temperature measurements of the stoichiometric specimen, a difference was observed between measurements during heating up and cooling down which seemed to be caused by a change of the oxygen to metal (O/M) ratio. Estimation of the O/M ratio decline by the Knudsen–Langmuir equation, which can be used to discuss evaporation behavior, suggested that the O/M ratio of the stoichiometric specimen had started to decrease at 1800K. For the O/M ratio of 1.95, that estimation showed that the O/M ratio did not change up to 2200K. It was also found from the experimental results that no significant changes of O/M ratios of specimens with O/M ratio less than 1.95 were observed.

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