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

Abstract

We investigate the phase diagram of lithium at temperatures of 200 to 400 K, to pressures over 100 GPa 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 40 and 60 GPa, below which the solid is crystalline. Analysis of the stability fieldsof the cI16 and oC88 phases suggest theexistence of atriple point betweenthese and an undetermined solid phase at 60 GPa between 220 and 255 K.

Authors:
 [1];  [1];  [1];  [2];  [3];  [2];  [1]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., Stanford, CA (United States). Physics Dept.
  3. Argonne National Lab. (ANL), Argonne, IL (United States).X-ray Science Division
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1542457
Alternate Identifier(s):
OSTI ID: 1547982; OSTI ID: 1562309
Grant/Contract Number:  
AC02-76SF00515; AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 123; Journal Issue: 6; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; High-pressure Lithium Melting

Citation Formats

Frost, Mungo, Kim, Jongjin B., McBride, Emma E., Peterson, J. Ryan, Smith, Jesse S., Sun, Peihao, and Glenzer, Siegfried. The High-Pressure Melt Curve and Phase Diagram of Lithium. United States: N. p., 2019. Web. doi:10.1103/PhysRevLett.123.065701.
Frost, Mungo, Kim, Jongjin B., McBride, Emma E., Peterson, J. Ryan, Smith, Jesse S., Sun, Peihao, & Glenzer, Siegfried. The High-Pressure Melt Curve and Phase Diagram of Lithium. United States. https://doi.org/10.1103/PhysRevLett.123.065701
Frost, Mungo, Kim, Jongjin B., McBride, Emma E., Peterson, J. Ryan, Smith, Jesse S., Sun, Peihao, and Glenzer, Siegfried. Mon . "The High-Pressure Melt Curve and Phase Diagram of Lithium". United States. https://doi.org/10.1103/PhysRevLett.123.065701. https://www.osti.gov/servlets/purl/1542457.
@article{osti_1542457,
title = {The High-Pressure Melt Curve and Phase Diagram of Lithium},
author = {Frost, Mungo and Kim, Jongjin B. and McBride, Emma E. and Peterson, J. Ryan and Smith, Jesse S. and Sun, Peihao and Glenzer, Siegfried},
abstractNote = {We investigate the phase diagram of lithium at temperatures of 200 to 400 K, to pressures over 100 GPa 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 40 and 60 GPa, below which the solid is crystalline. Analysis of the stability fieldsof the cI16 and oC88 phases suggest theexistence of atriple point betweenthese and an undetermined solid phase at 60 GPa between 220 and 255 K.},
doi = {10.1103/PhysRevLett.123.065701},
journal = {Physical Review Letters},
number = 6,
volume = 123,
place = {United States},
year = {2019},
month = {8}
}

Journal Article:

Citation Metrics:
Cited by: 4 works
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Figures / Tables:

FIG. 1 FIG. 1: Phase diagram of lithium. Filled circles show data points collected in this study, with orange circles indicating crystallinity, evidenced by Bragg diffraction, but with inconclusive indexing. Crosses and open symbols show melting points determined by other studies. Phase boundaries marked with solid lines take into account data frommore » both this and other studies. Grey dashed lines for the oC88, oC40 and oC24 phases are from ref. [8]. The dotted boundary of cI16 near 60 GPa and 230 K indicates the probable location of a triple point, with an uncharacterised phase between cI16 and the melt in blue. On isobaric cooling at low pressure the bcc to fcc transition does not occur, instead the metastable 9R state forms from bcc-lithium at lower temperature, as indicated by the striped region and black dotted line. All boundaries below 50 K are extrapolated.« less

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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.