High-temperature, high-pressure behavior of lithium fluoride
ORAL
Abstract
Lithium fluoride (LiF) is used extensively as optical windows in dynamic compression experiments and is also used as pressure media and thermal insulation in diamond-anvil cell (DAC) experiments. In order to better understand this important high-pressure standard and ubiquitous window material, we present high-temperature isothermal equations of state of LiF below its melting curve as measured in a laser-heated DAC. These measurements complement already measured low-T isotherms [Myint et al., JCP, 2019] performed with resistively-heated DACs and will be used to generate phase-aware, thermally accurate equations of state for LiF. Above its previously determined melting curve [Boehler et al., PRL, 1997], LiF exhibits strong changes in absorption, similar to other alkali halides [Arveson et al., PRB, 2018]. We explore these changes in optical properties and the significant consequences they have for temperature measurements measured spectroscopically.
*This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. LLNL-ABS-795563.
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Presenters
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Kanani Lee
- Lawrence Livermore Natl Lab