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

Abstract

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.

Authors:
 [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)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1421645
Alternate Identifier(s):
OSTI ID: 1408560
Report Number(s):
SAND-2018-0440J
Journal ID: ISSN 2469-9950; PRBMDO; 659974; TRN: US1801539
Grant/Contract Number:  
AC04-94AL85000; NA0003525
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 17; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

McCoy, Chad August, Knudson, Marcus David, and Root, Seth. Absolute measurement of the Hugoniot and sound velocity of liquid copper at multimegabar pressures. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.96.174109.
McCoy, Chad August, Knudson, Marcus David, & Root, Seth. Absolute measurement of the Hugoniot and sound velocity of liquid copper at multimegabar pressures. United States. doi:10.1103/PhysRevB.96.174109.
McCoy, Chad August, Knudson, Marcus David, and Root, Seth. Mon . "Absolute measurement of the Hugoniot and sound velocity of liquid copper at multimegabar pressures". United States. doi:10.1103/PhysRevB.96.174109. https://www.osti.gov/servlets/purl/1421645.
@article{osti_1421645,
title = {Absolute measurement of the Hugoniot and sound velocity of liquid copper at multimegabar pressures},
author = {McCoy, Chad August and Knudson, Marcus David and Root, Seth},
abstractNote = {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.},
doi = {10.1103/PhysRevB.96.174109},
journal = {Physical Review B},
number = 17,
volume = 96,
place = {United States},
year = {2017},
month = {11}
}

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