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Title: Boundaries for martensitic transition of 7Li under pressure

Journal Article · · Nature Communications
DOI:https://doi.org/10.1038/ncomms9030· OSTI ID:1212934
 [1];  [1];  [1]; ORCiD logo [2];  [3];  [2];  [1]
  1. Univ. of Utah, Salt Lake City, UT (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
  3. Carnegie Inst. of Washington, Argonne, IL (United States). Geophysical Lab.

We report that physical properties of lithium under extreme pressures continuously reveal unexpected features. These include a sequence of structural transitions to lower symmetry phases, metal-insulator-metal transition, superconductivity with one of the highest elemental transition temperatures, and a maximum followed by a minimum in its melting line. The instability of the bcc structure of lithium is well established by the presence of a temperature-driven martensitic phase transition. The boundaries of this phase, however, have not been previously explored above 3 GPa. All higher pressure phase boundaries are either extrapolations or inferred based on indirect evidence. Here we explore the pressure dependence of the martensitic transition of lithium up to 7 GPa using a combination of neutron and X-ray scattering. We find a rather unexpected deviation from the extrapolated boundaries of the hR3 phase of lithium. Furthermore, there is evidence that, above ~3 GPa, once in fcc phase, lithium does not undergo a martensitic transition.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC)
Grant/Contract Number:
AC02-06CH11357; NA0001974; FG02-99ER45775; 1351986; AC05-00OR22725
OSTI ID:
1212934
Alternate ID(s):
OSTI ID: 1265658
Journal Information:
Nature Communications, Vol. 6; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 15 works
Citation information provided by
Web of Science

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Quantum and isotope effects in lithium metal journal June 2017
Using forces to accelerate first-principles anharmonic vibrational calculations journalarticle January 2017
Perspective: Role of structure prediction in materials discovery and design journal May 2016
Perspective: Role of structure prediction in materials discovery and design text January 2016
Parallel background subtraction in diamond anvil cells for high pressure X-ray data analysis journal October 2019
Using forces to accelerate first-principles anharmonic vibrational calculations journal July 2017
Plasmons in Li under compression journal March 2019
A suite-level review of the neutron powder diffraction instruments at Oak Ridge National Laboratory journal September 2018