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

Abstract

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.

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) (SC-24); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); 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. doi: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. doi:10.1103/PhysRevLett.123.065701.
@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 = {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.},
doi = {10.1103/PhysRevLett.123.065701},
journal = {Physical Review Letters},
number = 6,
volume = 123,
place = {United States},
year = {2019},
month = {8}
}

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