Theoretical and experimental investigation of the equation of state of boron plasmas

被引：27

作者：

Zhang, Shuai ^{[1
]}

Militzer, Burkhard ^{[2
,3
]}

Gregor, Michelle C. ^{[1
]}

Caspersen, Kyle ^{[1
]}

Yang, Lin H. ^{[1
]}

Gaffney, Jim ^{[1
]}

Ogitsu, Tadashi ^{[1
]}

Swift, Damian ^{[1
]}

Lazicki, Amy ^{[1
]}

Erskine, D. ^{[1
]}

London, Richard A. ^{[1
]}

Celliers, P. M. ^{[1
]}

Nilsen, Joseph ^{[1
]}

Sterne, Philip A. ^{[1
]}

Whitley, Heather D. ^{[1
]}

机构：

[1] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

[2] Univ Calif Berkeley, Dept Earth & Planetary Sci, Berkeley, CA 94720 USA

[3] Univ Calif Berkeley, Dept Astron, 601 Campbell Hall, Berkeley, CA 94720 USA

来源：

PHYSICAL REVIEW E | 2018年 / 98卷 / 02期

基金：

美国国家科学基金会;

关键词：

TRANSPORT-COEFFICIENTS; STATISTICAL-MECHANICS; DENSE; SIMULATIONS; HYDROGEN; HOT; TEMPERATURE; PURGATORIO; CRYSTAL; MODEL;

D O I：

10.1103/PhysRevE.98.023205

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

We report a theoretical equation of state (EOS) table for boron across a wide range of temperatures (5.1 x 10(4) -5.2 x 10(8) K) and densities (0.25-49 g/cm(3)) and experimental shock Hugoniot data at unprecedented high pressures (5608 +/- 118 GPa). The calculations are performed with first-principles methods combining path-integral Monte Carlo (PIMC) at high temperatures and density-functional-theory molecular-dynamics (DFT-MD) methods at lower temperatures. PIMC and DFT-MD cross-validate each other by providing coherent EOS (difference <1.5 Hartree/boron in energy and <5% in pressure) at 5.1 x 10(5) K. The Hugoniot measurement is conducted at the National Ignition Facility using a planar shock platform. The pressure-density relation found in our shock experiment is on top of the shock Hugoniot profile predicted with our first-principles EOS and a semiempirical EOS table (LEOS 50). We investigate the self-diffusivity and the effect of thermal and pressure-driven ionization on the EOS and shock compression behavior in high-pressure and -temperature conditions. We also study the sensitivity of a polar direct-drive exploding pusher platform to pressure variations based on applying pressure multipliers to LEOS 50 and by utilizing a new EOS model based on our ab initio simulations via one-dimensional radiation-hydrodynamic calculations. The results are valuable for future theoretical and experimental studies and engineering design in high-energy density research.

引用

页数：12

共 114 条

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ALTSHULER LV, 1958, SOV PHYS JETP-USSR, V7, P614

[2]

[Anonymous], 1994, Dynamic Behavior of Materials, P66

[3] The Electron Transport Coefficients of Boron and Silicon Plasma [J].