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Boundaries for martensitic transition of 7Li under pressure

Author

Listed:
  • Anne Marie Schaeffer

    (University of Utah)

  • Weizhao Cai

    (University of Utah)

  • Ella Olejnik

    (University of Utah)

  • Jamie J. Molaison

    (Neutron Sciences Directorate, Oak Ridge National Laboratory)

  • Stanislav Sinogeikin

    (HPCAT, Geophysical Laboratory, Carnegie Institution of Washington)

  • Antonio M. dos Santos

    (Neutron Sciences Directorate, Oak Ridge National Laboratory)

  • Shanti Deemyad

    (University of Utah)

Abstract

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.

Suggested Citation

  • Anne Marie Schaeffer & Weizhao Cai & Ella Olejnik & Jamie J. Molaison & Stanislav Sinogeikin & Antonio M. dos Santos & Shanti Deemyad, 2015. "Boundaries for martensitic transition of 7Li under pressure," Nature Communications, Nature, vol. 6(1), pages 1-6, November.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms9030
    DOI: 10.1038/ncomms9030
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