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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