Sound speed measurements in lithium fluoride single crystals shock compressed to 168 GPa along [100]

Wallace, M. K.; Winey, J. M.; Gupta, Y. M.

doi:10.1063/5.0056659

Sound speed measurements in lithium fluoride single crystals shock compressed to 168 GPa along [100]

Journal Article · Thu Jul 15 00:00:00 EDT 2021 · Journal of Applied Physics

DOI:https://doi.org/10.1063/5.0056659· OSTI ID:1818134

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Washington State Univ., Pullman, WA (United States); Institute for Shock Physics, Washington State University
Washington State Univ., Pullman, WA (United States)

The shock wave response of [100] lithium fluoride (LiF) single crystals at high stresses is of long-standing interest due to their extensive use as optical windows in dynamic compression experiments. The report of melting in shock compressed LiF single crystals between 134 GPa and 152 GPa – based on a single sound speed datum [J. Appl. Phys. 117, 045901 (2015)] – was surprising because good optical transmission was previously demonstrated in LiF shock compressed to ~200 GPa [J. Appl. Phys. 116, 033515 (2014)]. To address these apparent differences, we report on plate impact experiments on [100] LiF single crystals shock compressed to 168 GPa. Wave profiles were measured using laser interferometry to determine Hugoniot states and longitudinal sound speeds in shock compressed LiF. The measured Hugoniot states are in good agreement with those measured in previous studies. However, the measured sound speeds presented here show no evidence of melting up to 168 GPa. In particular, the abrupt drop reported previously in sound speed at 152 GPa was not observed in the present work. Furthermore, our results establish a lower bound of 168 GPa for the onset of melting in shock compressed LiF single crystals.

View Accepted Manuscript (DOE)

Research Organization:: Washington State Univ., Pullman, WA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP)

Grant/Contract Number:: NA0003957

OSTI ID:: 1818134

Journal Information:: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 3 Vol. 130; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Sound speed measurements in lithium fluoride single crystals shock compressed to 168 GPa along [100]

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