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Title: Absolute measurement of the Hugoniot and sound velocity of liquid copper at multimegabar pressures

Journal Article · · Physical Review B
 [1];  [2];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Washington State Univ., Pullman, WA (United States)

Measurement of the Hugoniot and sound velocity provides information on the bulk modulus and Grüneisen parameter of a material at extreme conditions. The capability to launch multilayered (copper/aluminum) flyer plates at velocities in excess of 20 km/s with the Sandia Z accelerator has enabled high-precision sound-velocity measurements at previously inaccessible pressures. For these experiments, the sound velocity of the copper flyer must be accurately known in the multi-Mbar regime. Here we describe the development of copper as an absolutely calibrated sound-velocity standard for high-precision measurements at pressures in excess of 400 GPa. Using multilayered flyer plates, we performed absolute measurements of the Hugoniot and sound velocity of copper for pressures from 500 to 1200 GPa. These measurements enabled the determination of the Grüneisen parameter for dense liquid copper, clearly showing a density dependence above the melt transition. As a result, combined with earlier data at lower pressures, these results constrain the sound velocity as a function of pressure, enabling the use of copper as a Hugoniot and sound-velocity standard for pressures up to 1200 GPa.

Research Organization:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC04-94AL85000; NA0003525
OSTI ID:
1421645
Alternate ID(s):
OSTI ID: 1408560
Report Number(s):
SAND-2018-0440J; PRBMDO; 659974; TRN: US1801539
Journal Information:
Physical Review B, Vol. 96, Issue 17; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 18 works
Citation information provided by
Web of Science

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Cited By (5)

Theoretical investigation of the shock compressibility of copper in the average-atom approximation journal November 2018
Application of quantum-statistical methods to studies of thermodynamic and radiative processes in hot dense plasmas journal September 2019
Shock compression of fused silica: An impedance matching standard journal October 2019
Hugoniot, sound velocity, and shock temperature of MgO to 2300 GPa journal July 2019
Ion-beam-driven Planetary Physics Research at FAIR journal October 2018

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