Shock equation of state of LiH6 to 1.1 TPa

Abstract

Using laser-generated shock waves, we have measured pressure, density and temperature of LiH on the principal Hugoniot between 260 and 1100 GPa (2.6-11 Mbar) and on a second-shock Hugoniot up to 1400 GPa to near 5-fold compression, extending the maximum pressure reached in non-nuclear experiments by a factor of two. We observe the onset of metal-like reflectivity consistent with temperature-induced ionization of the Li 2s electron, and no sign of additional changes in ionization up to the maximum pressure. Our measurements are in good agreement with gas gun, Z-machine and underground test data and are accurately described by quantum molecular dynamics simulations. The results confirm the validity of equation of state models built on an average-atom description of the electron-thermal contribution to the free energy and a density-dependent Grüneisen parameter to describe shock response of LiH over this pressure range.

Recreating Giants Impacts in the Laboratory: Shock Compression of MgSiO3 Bridgmanite to 14 Mbar

“…Bridgmanite samples were synthesized in a multianvil apparatus by a direct reaction between finely powdered MgO and SiO at high‐pressure high‐temperature (HPHT) conditions (see details in the supporting information). As in previous experiments (Fratanduono et al, ; Lazicki et al, ; Millot et al, ; Root et al, ), the targets used in the present experiments contained a planar package with a 50 m polyimide (Kapton) ablator, a 50 m ‐quartz reference plate having a 3 m thick Au layer deposited on top of a 100 nm Ta coating, a 100–140 m bridgmanite crystal and a second 40 m quartz plate having an antireflection coating (see Figure ).…”

Energy loss of α-particle in the non-equilibrium plasma of deuterium mixed with lithium

“…Recently, Kulsartov et al [20] have experimentally studied the T release processes from two-phase Li ceramics of Li 4 SiO 4 /Li 2 TiO 3 during neutron irradiation when H and D are injected into the chamber with irradiated samples, and found a preferential increase in the release of DT molecules when the pressure of D in the gas phase increases. In addition, the design and construction of corresponding high-energy neutron source, in which D 6 Li [27][28][29][30][31][32][33] is a potential fuel option, is also greatly important to solve the problems of nuclear fuel cycle circuit and positive energy gain of future clean energy systems. Such systems has been suggested as drivers of hybrid fusion-fission reactors for nuclear power generation and production of T.…”