Thermophysical properties of uranium dioxide

The Development of Models to Optimize Selection of Nuclear Fuels through Atomic-Level Simulation

“…In the same figure, a polynomial fit by Fink to numerous experimental data is shown. 13 The fits consist of two distinct regions of temperature; below and above 923K. The lattice parameter obtained from the Busker potential shows a maximum deviation of 0.5% at 1500K from the experimental value.…”

“…The defect formation energies of anti-Frenkel, Frenkel and Schottky defects are approximately 4 eV, 10 eV, and 6 eV. Although the Schottky trio formation energy is higher than anti-Frenkel pair, they play important role at high temperature 13,38 . There is also a recent MD simulation study performed by Yamasaki et al 40 on the thermal conductivity of UO 2+x .…”

“…In UO 2 , the predominant point defects are anti-Frenkel pairs 13,37,38,39 . The defect formation energies of anti-Frenkel, Frenkel and Schottky defects are approximately 4 eV, 10 eV, and 6 eV.…”

Thoria Ehancement of Nuclear Reactor Safety

“…Recently Fink (2000) made recommendations for the thermal conductivity correlation of stoichiometric UO 2 and in the recent review (Carbajo et al, 2001) correlation was provided for oxidized urania. In these proposed correlations the high temperature contribution Science Publications PI is fitted by a single (ambipolar) term without separation of the radiative contribution.…”

“…Therefore we only plotted the phonon contribution for stoichiometric urania (triangles) and as indicated it is the only mechanism responsible for thermal conductivity at low temperature. Fink's (2000) correlation (indicated by solid line) was developed for 95% dense urania fuel without the dependence on (x) and it is more conservative at lower temperature while slightly higher thermal conductivity is predicted at high temperatures.…”