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Title: Shock-compressed silicon: Hugoniot and sound speed up to 2100 GPa

Journal Article · · Physical Review B

In this work, the high-pressure equation of state and isentropic sound speed of fluid silicon were studied using laser-driven shock waves. Principal Hugoniot measurements to 2100 GPa were performed using impedance matching to an α-quartz reference. Sound speed was determined by time correlating imposed shock-velocity perturbations in both the sample (Si) and reference material (α-quartz). A change in shock velocity versus particle velocity (us–up) slope on the fluid silicon principal Hugoniot was detected at 200 GPa. Density functional theory-based quantum molecular dynamics simulations suggest that an increase in ionic coordination and 50% increase in average ionization is coincident with the experimentally observed change in slope.

Research Organization:
Univ. of Rochester, NY (United States). Lab. for Laser Energetics; Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0003856; NA0003525; AC52-07NA27344; AC04-94AL85000
OSTI ID:
1773498
Alternate ID(s):
OSTI ID: 1781580; OSTI ID: 1871392
Report Number(s):
SAND-2021-5066J; LLNL-JRNL-835474; 2019-324, 1638, 6354; TRN: US2209080
Journal Information:
Physical Review B, Vol. 103, Issue 9; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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