Mechanical and optical response of [100] lithium fluoride to multi-megabar dynamic pressures
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Washington State Univ., Pullman, WA (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
An understanding of the mechanical and optical properties of lithium fluoride (LiF) is essential to its use as a transparent tamper and window for dynamic materials experiments. In order to improve models for this material, we applied iterative Lagrangian analysis to ten independent sets of data from magnetically-driven planar shockless compression experiments on single crystal [100] LiF to pressures as high as 350 GPa. We found that the compression response disagreed with a prevalent tabular equation of state for LiF that is commonly used to interpret shockless compression experiments. We also present complementary data from ab initio calculations performed using the diffusion quantum Monte Carlo method. The agreement between these two data sets lends confidence to our interpretation. In order to aid in future experimental analysis, we have modified the tabular EOS to match the new data. We have also extended knowledge of the optical properties of LiF via shock-compression and shockless compression experiments, refining the transmissibility limit, measuring the refractive index to ~300 GPa, and confirming the nonlinear dependence of the refractive index on density. We present a new model for the refractive index of LiF that includes temperature dependence, and describe a procedure for correcting apparent velocity to true velocity for dynamic compression experiments.
- Research Organization:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA), Office of Defense Science (NA-113)
- Grant/Contract Number:
- AC04-94AL85000; AC52-06NA25396
- OSTI ID:
- 1335133
- Alternate ID(s):
- OSTI ID: 1330116; OSTI ID: 1345941
- Report Number(s):
- SAND-2016-10421J; LA-UR-16-26527; JAPIAU; 648345
- Journal Information:
- Journal of Applied Physics, Vol. 120, Issue 16; ISSN 0021-8979
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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