Lithium at high dynamic pressure

Abstract

Experimental investigation of lithium compressed by multiple shock waves up to a pressure 210 GPa demonstrates an abnormal dependence on electric resistivity. As against normal behaviour of a metal, the resistivity monotonically increases in the pressure range 30–150 GPa from typical metallic values at ambient conditions by more than 15 times, returning to metallic values at pressures higher then 160–210 GPa. The obtained results demonstrate the anomalous resistivity of lithium both in solid and liquid states. This effect is explained by theoretical calculations done with the use of the linear muffin-tin orbital method.

Complex Behavior of Fluid Lithium under Extreme Conditions

“…The surprising complexity in the variation of the conductivity has been explained by analyzing the ion-ion PCF, the DOS, and structural changes. The agreement of our ab initio results with multiple shock-compression experiments is excellent for densities up to 1.7 [4,5] and 2:15 g=cm 3 [6]. We have identified three different density regions with specific physical properties: the expanded fluid for low densities, the fluid metal around normal densities, and the degenerate electron liquid at the highest densities.…”

“…We next compare with a second series of multiple shockcompression experiments [4,5] in Fig. 2, which were performed in a similar density range % 1-4:5% 0 but at temperatures below 3000 K. Again, the conductivity isotherms derived from the QMD simulations cover the experimental data well for densities up to 1:7 g=cm 3 .…”

Reply to comment by Witte et al. on "Isochoric, isobaric, and ultrafast conductivities of aluminum, lithium,and carbon in the warm dense matter regime", Phys. Rev. E $96$, 053206 (2017)

“…In response, and as justification, Witte et al sent their Li-σ comparisons with experimental data [11,12]. Our NPA results on Li agree with theirs, except at ρ = 0.6 g/cm 3 and T = 4.5 eV [13].…”

Intense shock waves and extreme states of matter

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