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Title: Optical and transport properties of dense liquid silica

Abstract

Using density-functional-theory based molecular dynamics and the Kubo-Greenwood linear response theory, we evaluated the high-pressure equation of state and the optical and transport properties of quartz and fused silica shock-compressed to 2000 GPa. Here, the computed Hugoniots and corresponding optical reflectivity values are in very good agreement with published data for quartz, and new data that we obtained on fused silica using magnetically launched flyer plate experiments. The rise of optical reflectivity upon shock compression appears to be primarily a temperature-driven mechanism, which is relatively insensitive to small density variation. We observed that the electrical conductivity does not display Drude-like frequency dependence, especially at lower temperatures. In addition, the Wiedemann-Franz relation between electrical and thermal conductivities was found to be invalid. It suggests that even at three-fold compression, warm dense liquid silica on the Hugoniot curve is still far away from the degenerate limit.

Authors:
 [1]; ORCiD logo [1];  [1];  [2];  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); National Aeronautics and Space Administration (NASA)
OSTI Identifier:
1788340
Alternate Identifier(s):
OSTI ID: 1228630
Report Number(s):
LLNL-JRNL-661459
Journal ID: ISSN 1070-664X; 782006; TRN: US2210586
Grant/Contract Number:  
AC52-07NA27344; AC04-94AL85000; NNH12AU44I
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 22; Journal Issue: 6; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Hugoniot curve; Silicates; Thermal conductivity; Shock compression; Glass; Density functional theory; Transport properties; Equations of state; Shock waves; Electrical conductivity

Citation Formats

Qi, Tingting, Millot, Marius, Kraus, Richard G., Root, Seth, and Hamel, Sebastien. Optical and transport properties of dense liquid silica. United States: N. p., 2015. Web. doi:10.1063/1.4922471.
Qi, Tingting, Millot, Marius, Kraus, Richard G., Root, Seth, & Hamel, Sebastien. Optical and transport properties of dense liquid silica. United States. https://doi.org/10.1063/1.4922471
Qi, Tingting, Millot, Marius, Kraus, Richard G., Root, Seth, and Hamel, Sebastien. Fri . "Optical and transport properties of dense liquid silica". United States. https://doi.org/10.1063/1.4922471. https://www.osti.gov/servlets/purl/1788340.
@article{osti_1788340,
title = {Optical and transport properties of dense liquid silica},
author = {Qi, Tingting and Millot, Marius and Kraus, Richard G. and Root, Seth and Hamel, Sebastien},
abstractNote = {Using density-functional-theory based molecular dynamics and the Kubo-Greenwood linear response theory, we evaluated the high-pressure equation of state and the optical and transport properties of quartz and fused silica shock-compressed to 2000 GPa. Here, the computed Hugoniots and corresponding optical reflectivity values are in very good agreement with published data for quartz, and new data that we obtained on fused silica using magnetically launched flyer plate experiments. The rise of optical reflectivity upon shock compression appears to be primarily a temperature-driven mechanism, which is relatively insensitive to small density variation. We observed that the electrical conductivity does not display Drude-like frequency dependence, especially at lower temperatures. In addition, the Wiedemann-Franz relation between electrical and thermal conductivities was found to be invalid. It suggests that even at three-fold compression, warm dense liquid silica on the Hugoniot curve is still far away from the degenerate limit.},
doi = {10.1063/1.4922471},
journal = {Physics of Plasmas},
number = 6,
volume = 22,
place = {United States},
year = {Fri Jun 12 00:00:00 EDT 2015},
month = {Fri Jun 12 00:00:00 EDT 2015}
}

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Cited by: 22 works
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Works referencing / citing this record:

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