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Shock equation of state of 6LiH to 1.1 TPa.

Shock equation of state of 6LiH to 1.1 TPa.

Authors :
Lazicki, A.
London, R. A.
Coppari, F.
Erskine, D.
Whitley, H. D.
Caspersen, K. J.
Fratanduono, D. E.
Morales, M. A.
Celliers, P. M.
Eggert, J. H.
Millot, M.
Swift, D. C.
Collins, G. W.
Kucheyev, S. O.
Castor, J. I.
Nilsen, J.
Source :
Physical Review B. 10/1/2017, Vol. 96 Issue 13, p1-1. 1p.
Publication Year :
2017

Abstract

Using laser-generated shock waves, we have measured pressure, density, and temperature of LiH on the principal Hugoniot between 260 and 1100 GPa (2.6-11 Mbar) and on a second-shock Hugoniot up to 1400 GPa to near fivefold compression, extending the maximum pressure reached in non-nuclear experiments by a factor of two. We observe the onset of metal-like reflectivity consistent with temperature-induced ionization of the Li 2s electron, and no sign of additional changes in ionization up to the maximum pressure. Our measurements are in good agreement with gas gun, Z-machine, and underground test data and are accurately described by quantum molecular dynamics simulations. The results confirm the validity of equation of state models built on an average-atom description of the electron-thermal contribution to the free energy and a density-dependent Grüneisen parameter to describe shock response of LiH over this pressure range. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
24699950
Volume :
96
Issue :
13
Database :
Academic Search Index
Journal :
Physical Review B
Publication Type :
Academic Journal
Accession number :
126717158
Full Text :
https://doi.org/10.1103/PhysRevB.96.134101