Temperature and melting of laser-shocked iron releasing into an LiF window

Abstract

Measurement of the shock-heated melt curve of lead using pyrometry and reflectometry

X-ray absorption spectroscopy of iron at multimegabar pressures in laser shock experiments

“…However, previous dynamic compression measurements of the solid -liquid transition along the shock Hugoniot have shown important discrepancies [8][9][10][11][12]. As a result, the actual melting temperature of iron measured in dynamic compression experiments is showing a variation of more than 2000 K around 250 GPa.…”

“…As a reference, the melting curve of pure iron, the main constituent of Earth's and Earth like planetary cores, is of a critical importance and has been the purpose of numerous experimental and theoretical works [1][2][3][4][5][6][7][8][9][10][11][12]. It remains up to now largely uncertain mainly due to experimental difficulties in reaching and detecting melting of iron at terrestrial Inner Core Boundary (ICB) conditions, where the pressure is of 330 GPa.…”

“…Dynamic compression offers the possibility to provide measurement of iron at pressures and temperatures close to the ICB conditions [8][9][10][11][12][13] and beyond, as needed for the modeling of planets larger than the Earth. However, previous dynamic compression measurements of the solid -liquid transition along the shock Hugoniot have shown important discrepancies [8][9][10][11][12].…”

Hugoniot and refractive indices of bromoform under shock compression

“…[4][5][6][7][8][9][10] Elastic precursor decay, stress relaxation, and elasticplastic two wave structure in weakly shocked solid windows may complicate wave characteristics and interpretation of interferometry measurements, 11,12 while liquid windows are immune to such complications. In addition, liquid windows broaden the spectrum of impedance for impedance match purposes.…”

Measurement of Short-Range Correlations in Shock-Compressed Plastic by Short-Pulse X-Ray Scattering

“…Such a peculiar state of matter not only exhibits strongly nonideal plasma features, such as ion dynamics dominated by Coulomb interactions and liquid state short-range order, but also partly degenerate free electrons. The basic thermodynamics of WDM thus remains poorly described, despite its relevance in inertial confinement fusion [1], geophysics [2], and planetary astrophysics [3,4]. Since a few years ago, a new experimental technique based on x-ray scattering [5] has allowed new insights into the microscopic structure of WDM states.…”