Abstract
The thermal conductivities of stoichiometric (Pu, R)O 2 solid solutions containing RO 1.5 (R = Nd and Y) up to 10 mol% were determined by the laser flash method in the temperature range 700–1400 K. The thermal conductivities for all solid solutions satisfied the phonon conduction equation K = ( A + BT) −1 within ± 6%. The lattice defect thermal resistivities (= A) increased gradually with the neodymium or yttrium content, while the intrinsic lattice thermal resistivities (= BT) were nearly equal to that measured for PuO 2. The measured thermal conductivities were consistent with the results of the lattice defect model calculation in which Pu 4+, Pu 5+ and R 3+ ions were considered as phonon scattering centers. The lattice strain parameters ϵ = 85 and 93 were obtained for (Pu, Nd)O 2 and (Pu, Y)O 2 solid solutions, respectively.
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