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Title: Refractive index of lithium fluoride to 900 gigapascal and implications for dynamic equation of state measurements

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/1.5091722· OSTI ID:1557060

Lithium fluoride (LiF) is a unique crystal possessing the largest reported bandgap of any material and is predicted to remain transparent to visible light under stresses in excess of 1000 GPa. Dynamic compression experiments often utilize LiF as a window material to maintain stress on a sample while enabling direct measurements of interface velocity. However, typical velocimetry diagnostics measure changes in the optical path length; therefore, an accurate understanding of LiF’s equation of state and refractive index is needed. Here, we present a measurement of the LiF refractive index up to 900 GPa from a low-temperature ramp-compression experiment at the National Ignition Facility. To demonstrate propagation of optical uncertainty from this work to equation of state measurements, simulations in which a tin–LiF interface reaches a peak stress of 825 GPa show that the principal isentrope of tin can be determined up to 1450 GPa with a 1.2% uncertainty in density while considering uncertainties in the optical response of LiF.

Research Organization:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC)
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1557060
Alternate ID(s):
OSTI ID: 1510158; OSTI ID: 1545328
Report Number(s):
LLNL-JRNL-767294; 957376
Journal Information:
Journal of Applied Physics, Vol. 125, Issue 17; ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 20 works
Citation information provided by
Web of Science

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Cited By (2)

Coordination changes in liquid tin under shock compression determined using in situ femtosecond x-ray diffraction journal December 2019
Path integral Monte Carlo and density functional molecular dynamics simulations of warm dense MgSiO 3 journal January 2020

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