This content will become publicly available on August 14, 2015
Boundaries for martensitic transition of 7Li under pressure
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.
- Univ. of Utah, Salt Lake City, UT (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
- Carnegie Inst. of Washington, Argonne, IL (United States). Geophysical Lab.
- Publication Date:
- OSTI Identifier:
- Grant/Contract Number:
- AC02-06CH11357; NA0001974; FG02-99ER45775; 1351986; AC05-00OR22725
- Accepted Manuscript
- Journal Name:
- Nature Communications
- Additional Journal Information:
- Journal Volume: 6; Journal ID: ISSN 2041-1723
- Nature Publishing Group
- Research Org:
- Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
- Sponsoring Org:
- USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC)
- Country of Publication:
- United States
- 36 MATERIALS SCIENCE; Lithium; high pressure; crystallography
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