Quantum molecular dynamics simulations of uranium at high pressure and temperature

Hood, R Q; Yang, L H; Moriarty, J A

doi:10.1103/PhysRevB.78.024116

Title: Quantum molecular dynamics simulations of uranium at high pressure and temperature

Journal Article · Tue Jan 22 00:00:00 EST 2008 · Physical Review B, vol. 78, no. 2, July 22, 2008, pp. 024116-024124

DOI:https://doi.org/10.1103/PhysRevB.78.024116· OSTI ID:944285

Hood, R Q; Yang, L H; Moriarty, J A

Constant-volume quantum molecular dynamics (QMD) simulations of uranium (U) have been carried out over a range of pressures and temperatures that span the experimentally observed solid orthorhombic {alpha}-U, body-centered cubic (bcc), and liquid phases, using an ab initio plane-wave pseudopotential method within the generalized gradient approximation of density functional theory. A robust U pseudopotential has been constructed for these simulations that treats the 14 valence and outer-core electrons per atom necessary to calculate accurate structural and thermodynamic properties up to 100 GPa. Its validity has been checked by comparing low-temperature results with experimental data and all-electron full-potential linear-muffin-tin-orbital calculations of several different uranium solid structures. Calculated QMD energies and pressures for the equation of state of uranium in the solid and liquid phases are given, along with results for the Grueneisen parameter and the specific heat. We also present results for the radial distribution function, bond-angle distribution function, electronic density of states, and liquid diffusion coefficient, as well as evidence for short-range order in the liquid.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: W-7405-ENG-48

OSTI ID:: 944285

Report Number(s):: LLNL-JRNL-401224; TRN: US0900547

Journal Information:: Physical Review B, vol. 78, no. 2, July 22, 2008, pp. 024116-024124, Vol. 78, Issue 2

Country of Publication:: United States

Language:: English

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