The High-Pressure Melt Curve and Phase Diagram of Lithium

Frost, Mungo; Kim, Jongjin B.; McBride, Emma E.; Peterson, J. Ryan; Smith, Jesse S.; Sun, Peihao; Glenzer, Siegfried

doi:10.1103/PhysRevLett.123.065701

Title: The High-Pressure Melt Curve and Phase Diagram of Lithium

Journal Article · 05 August 2019 · Physical Review Letters

DOI: https://doi.org/10.1103/PhysRevLett.123.065701 · OSTI ID:1542457

Frost, Mungo ^[1]; Kim, Jongjin B. ^[1]; McBride, Emma E. ^[1]; Peterson, J. Ryan ^[2]; Smith, Jesse S. ^[3]; Sun, Peihao ^[2]; Glenzer, Siegfried ^[1]

SLAC National Accelerator Lab., Menlo Park, CA (United States)
SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., Stanford, CA (United States). Physics Dept.
Argonne National Lab. (ANL), Argonne, IL (United States).X-ray Science Division

This study investigates the phase diagram of lithium at temperatures of 200K to 400 K, to pressures over 100GPa using X-ray diffraction in diamond anvil cells, covering the region in which the melting curve is disputed. To overcome degradation of the diamond anvils by dense lithium we utilize a rapid compression scheme taking advantage of the high flux available at modern synchrotrons. Our results show the hR1 and cI16 phases to be stable to higher temperature than previously reported. The melting minima of lithium is found to be close to room temperature between 40GPa and 60GPa, below which the solid is crystalline. Finally, analysis of the stability fields of the cI16 and oC88 phases suggest the existence of a triple point between these and an undetermined solid phase at 60GPa between 220K and 255 K.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC02-76SF00515; AC02-06CH11357

OSTI ID:: 1542457

Alternate ID(s):: OSTI ID: 1547982; OSTI ID: 1562309

Journal Information:: Physical Review Letters, Vol. 123, Issue 6; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 16 works

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