Boundaries for martensitic transition of 7Li under pressure

Anne Marie Schaeffer, Weizhao Cai, Ella Olejnik, Jamie J. Molaison, Stanislav Sinogeikin, Antonio M. dos Santos and Shanti Deemyad ()
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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

Nature Communications, 2015, vol. 6, issue 1, 1-6

Abstract: 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.

Date: 2015
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DOI: 10.1038/ncomms9030

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