Thermal Conductivity of Ceramic Solid Solutions

1 January 1970

journal article
Published by Taylor & Francis in Journal of Nuclear Science and Technology

Vol. 7 (11) , 559-563
https://doi.org/10.3327/jnst.7.559

Abstract

The thermal conductivity of ThO₂-UO₂ and ThO₂-CeO₂ systems were measured by laser flash method, and the results are discussed with the aid of the relaxation-time theory. Two parameters characteristic to systems of the same base — the ratio α of scattering rates between N- and U-scatterings and the strain parameter ϵ— were determined experimentally from the measured thermal conductivity of the ThO₂-UO₂ system at 25°C. Using these parameters, the thermal conductivities of ThO₂-UO₂ system at 100° and 500°C and that of ThO(₂-CeO₂ at 25°C were calculated. The results obtained agree very well with the experimental values. In the ThO₂-UO₂ system, the predominant contribution to the scattering cross section of phonons is the strain factor, while in the ThO₂-CeO₂ system, the contribution from the mass factor increases, which makes the thermal resistivity of the ThO₂-CeO₂ system higher than that of the ThO₂-UO₂.

Keywords

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