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Mechanical and optical response of [100] lithium fluoride to multi-megabar dynamic pressures

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/1.4965869· OSTI ID:1335133
 [1];  [2];  [1];  [3]
  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)
  3. 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 equation of state 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. Lastly, 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 Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Science (NA-113)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1335133
Alternate ID(s):
OSTI ID: 1330116
OSTI ID: 1345941
Report Number(s):
SAND--2016-10421J; 648345
Journal Information:
Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 16 Vol. 120; ISSN JAPIAU; ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (7)

Mechanical response of lithium fluoride under off-principal dynamic shock-ramp loading journal October 2016
X-ray diffraction of ramp-compressed aluminum to 475 GPa journal August 2018
Direct calculation of sound speed of materials under ramp wave compression journal November 2018
Two-phase equation of state for lithium fluoride journal February 2019
Refractive index of lithium fluoride to 900 gigapascal and implications for dynamic equation of state measurements journal May 2019
Crystal structure and equation of state of Fe-Si alloys at super-Earth core conditions journal April 2018
Insulator-metal transition in dense fluid deuterium journal August 2018

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