High-pressure thermophysical properties of solid and liquid uranium

Quantum molecular dynamics simulations of uranium at high pressure and temperature

“…Using the experimental specific heats ratio C P /C V = 1.5 determined at T = 1810 K in the liquid 62 we estimate C P to be 195 J/kg·K in liquid uranium. This compares favorably with the experimental value for C P of 210 J/kg·K in the liquid state obtained at the atomic volume 25.06Å 3 from isobaric expansion measurements.…”

Thermophysical properties of solid and liquid pure and alloyed Pu: A review

“…lanthanides -4f shell -and actinides -5f shell -), two exceptions such as Ce [19,20] and Pu [2,18] are registered by presenting a volume contraction and then an increase of sound velocity occurring on melting and further up in the liquid state in a certain temperature range depending on the material. For these two cases the volume contraction is interpreted as an effect of the hybridization of their f electrons with the conduction bands [2,19,20]. For the specific case of Pu and its alloy, it would be due to the broadening and lowering of the 5f wave functions which consequently form overlapping energy bands with the 6d7s conduction shell.…”

Uranium critical point problem

“…The large value of critical pressure p c % 845 GPa has been also obtained in calculations by SAHA-U(H) code with the caloric calibration. [29] (after [34]); 3 -isobaric expansion [32]; Theoretical predictions of critical point: 4 -based on caloric EOS of condensed phase [25][26][27]4], etc. 5 -based on experimental data on thermal EOS of condensed phase [33,5]; 6 -based on Ôplasma hypothesisÕ [36,37].…”

“…1). Experimental data on thermal EOS: 1 -saturation curve p ~ 0 [30]; 2 − isobaric expansion (p ≅ 0.4 GPa) [29] (after [34]); 3 -isobaric expansion [32]; Theoretical predictions of critical point: 4 -based on caloric EOS of condensed phase [25], [26], [27] [4] etc. ; 5 -based on experimental data on thermal EOS of condensed phase [33], [5]; 6 -based on «plasma hypothesis» [36], [37].…”