Jon Eggert

TL;DR: In situ x-ray diffraction studies of iron under shock conditions confirm unambiguously a phase change from the bcc (alpha) to hcp (epsilon) structure, and are in good agreement with large-scale nonequilibrium molecular dynamics simulations.

TL;DR: The atomic structure of H2O is documented at several million atmospheres of pressure and temperatures of several thousand degrees, revealing shockwave-induced ultrafast crystallization and a novel water ice phase, ice XVIII, with exotic superionic properties.

TL;DR: Ramp-compression measurements for diamond are described, which can be compared to first-principles density functional calculations and theories long used to describe matter present in the interiors of giant planets, in stars, and in inertial-confinement fusion experiments, and provide new constraints on mass–radius relationships for carbon-rich planets.

TL;DR: In this paper, the authors used time-resolved optical pyrometry and laser velocimetry measurements as well as supporting density functional theory-molecular dynamics (DFT-MD) simulations to verify a 30-year-old prediction of superionic conduction in water ice at planetary interior conditions.

TL;DR: In this paper, the melting point of diamond at pressures of around 10 million atm was measured and it was shown that at high pressures and temperatures about 50,000 K, diamond melts to form an unexpectedly complex, polymer-like fluid phase.