Optical and transport properties of dense liquid silica
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
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.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA); National Aeronautics and Space Administration (NASA)
- Grant/Contract Number:
- AC52-07NA27344; AC04-94AL85000; NNH12AU44I
- OSTI ID:
- 1788340
- Alternate ID(s):
- OSTI ID: 1228630
- Report Number(s):
- LLNL-JRNL-661459; 782006; TRN: US2210586
- Journal Information:
- Physics of Plasmas, Vol. 22, Issue 6; ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Thermodynamically complete equation of state of MgO from true radiative shock temperature measurements on samples preheated to 1850 K
|
journal | January 2018 |
Shock compression of fused silica: An impedance matching standard
|
journal | October 2019 |
Measurements of the sound velocity of shock-compressed liquid silica to 1100 GPa
|
journal | December 2016 |
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