Pressure dependence of thermal conductivity for lithium fluoride to 36 GP

POSTER

Abstract

Room-temperature measurements of the thermal conductivity of single-crystal LiF compressed in a diamond-anvil cell show an increase from k = 12.8 (+/- 1.3) Wm-1K-1 to 38.5 (+/- 5.2) Wm-1K-1 from 0-36 GPa. Our time-domain thermal reflectance (TDTR) experiments imply a compression dependence of (∂logk/∂logr)T = 3.8 for LiF, in general agreement with theoretical expressions for phonon scattering in dielectrics. Lithium fluoride is commonly used as a window material in dynamic compression experiments, and our thermal conductivity measurements provide new constraints on the corrections that need to be applied to shock temperatures measured on opaque samples.

*This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344 and supported by the Laboratory Directed Research and Development program under project 24-ERD-021

Presenters

  • Mercedes M Vasquez

    • University of California, Berkeley

Authors

  • Mercedes M Vasquez

    • University of California, Berkeley

  • Chris P McGuire

    • Lawrence Livermore National Laboratory

  • Suixuan Li

    • University of California, Los Angeles

  • Yongjie Hu

    • University of California, Los Angeles