Thermal and transport properties of U3Si2

Abstract

We have studied U3Si2 by means of the heat capacity, electrical resistivity, Seebeck and Hall effects, and thermal conductivity in the temperature range 2-300 K and in magnetic fields up to 9 T. All the results obtained point to delocalized nature of 5f-electrons in this material. The low temperature heat capacity is enhanced (gel ~ 150 mJ/mol-K 2 ) and shows an upturn in Cp/T (T), characteristic of spin fluctuations. The thermal conductivity of U3Si2 is ~8.5 W/m-K at room temperature and we show that the electronic part dominates heat transport above 300 K as expected for a metallic system, although the lattice contribution cannot be completely neglected.

First-principles investigations on the anisotropic elasticity and thermodynamic properties of U3Si2–Al

“…By solving the linearized Boltzmann transport equation, the lattice thermal conductivity in different directions can be accurately calculated; where the electronic transport properties are approximated with the relaxation time s ¼ 0.68 Â 10 À14 s evaluated using r at 300 K obtained from experiments. 46 The anisotropic lattice thermal conductivity of U 3 Si 2 , sub-U 3 Si 1.5 Al 0.5 and sub-U 2.5 Si 2 Al 0.5 (I) is calculated, as shown in Fig. 5(a-c), the inset is the curve of K zz /K xx with temperature.…”

Magnetic, transport, and thermal properties of $δ$-phase UZr$_2$

“…3(a). The overall shape and magnitude of ρ(T ) is typical for uranium intermetallic compounds [22,45]. The residual-resistivity ratio (RRR), defined as ρ(300K)/ρ(0K) is low and estimated to be ∼1.05.…”

Progress update on lower length scale research and development on U3Si2 fuel and FeCrAl cladding

“…It was fitted to the experimentally measured data for several U-Si compounds before irradiation [20][21][22][23]. The model has been used to calculate the overall thermal conductivity of a recently fabricated U 3 Si 2 sample containing USi phase [24]. However, the previously reported data for U 3 Si 2 was later corrected with new much lower conductivity data.…”