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Title: Influence of defects on the thermal conductivity of compressed LiF

We report defect formation in LiF, which is used as an observation window in ramp and shock experiments, has significant effects on its transmission properties. Given the extreme conditions of the experiments it is hard to measure the change in transmission directly. Using molecular dynamics, we estimate the change in conductivity as a function of the concentration of likely point and extended defects using a Green-Kubo technique with careful treatment of size effects. With this data, we form a model of the mean behavior and its estimated error; then, we use this model to predict the conductivity of a large sample of defective LiF resulting from a direct simulation of ramp compression as a demonstration of the accuracy of its predictions. Given estimates of defect densities in a LiF window used in an experiment, the model can be used to correct the observations of thermal energy through the window. Also, the methodology we develop is extensible to modeling, with quantified uncertainty, the effects of a variety of defects on the thermal conductivity of solid materials.
Authors:
 [1] ;  [1]
  1. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Publication Date:
Report Number(s):
SAND-2017-12204J
Journal ID: ISSN 2469-9950; PRBMDO; 658623
Grant/Contract Number:
AC04-94AL85000; NA0003525; NA-0003525
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 97; Journal Issue: 5; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE
OSTI Identifier:
1429683
Alternate Identifier(s):
OSTI ID: 1419906

Jones, R. E., and Ward, D. K.. Influence of defects on the thermal conductivity of compressed LiF. United States: N. p., Web. doi:10.1103/PhysRevB.97.054103.
Jones, R. E., & Ward, D. K.. Influence of defects on the thermal conductivity of compressed LiF. United States. doi:10.1103/PhysRevB.97.054103.
Jones, R. E., and Ward, D. K.. 2018. "Influence of defects on the thermal conductivity of compressed LiF". United States. doi:10.1103/PhysRevB.97.054103.
@article{osti_1429683,
title = {Influence of defects on the thermal conductivity of compressed LiF},
author = {Jones, R. E. and Ward, D. K.},
abstractNote = {We report defect formation in LiF, which is used as an observation window in ramp and shock experiments, has significant effects on its transmission properties. Given the extreme conditions of the experiments it is hard to measure the change in transmission directly. Using molecular dynamics, we estimate the change in conductivity as a function of the concentration of likely point and extended defects using a Green-Kubo technique with careful treatment of size effects. With this data, we form a model of the mean behavior and its estimated error; then, we use this model to predict the conductivity of a large sample of defective LiF resulting from a direct simulation of ramp compression as a demonstration of the accuracy of its predictions. Given estimates of defect densities in a LiF window used in an experiment, the model can be used to correct the observations of thermal energy through the window. Also, the methodology we develop is extensible to modeling, with quantified uncertainty, the effects of a variety of defects on the thermal conductivity of solid materials.},
doi = {10.1103/PhysRevB.97.054103},
journal = {Physical Review B},
number = 5,
volume = 97,
place = {United States},
year = {2018},
month = {2}
}