Ultra-high pressure dynamic compression of geological materials

TS Duffy, RF Smith - Frontiers in Earth Science, 2019 - frontiersin.org
Dynamic-compression experiments on geological materials are important for understanding
the composition and physical state of the deep interior of the Earth and other planets. These …

In situ synchrotron X-ray diffraction in the laser-heated diamond anvil cell: Melting phenomena and synthesis of new materials

A Salamat, RA Fischer, R Briggs, MI McMahon… - Coordination Chemistry …, 2014 - Elsevier
The ability to produce high pressures and temperatures (P–T), and study the physical and
chemical properties of solids and melts at these conditions, is possible through the use of …

Predicting crystal structures and properties of matter under extreme conditions via quantum mechanics: the pressure is on

E Zurek, W Grochala - Physical Chemistry Chemical Physics, 2015 - pubs.rsc.org
Experimental studies of compressed matter are now routinely conducted at pressures
exceeding 1 mln atm (100 GPa) and occasionally at pressures greater than 10 mln atm (1 …

Machine-Learning Accelerated First-Principles Accurate Modeling of the Solid–Liquid Phase Transition in MgO under Mantle Conditions

P Wisesa, CM Andolina, WA Saidi - The Journal of Physical …, 2023 - ACS Publications
While accurate measurements of MgO under extreme high-pressure conditions are needed
to understand and model planetary behavior, these studies are challenging from both …

Electrical conductivity and magnetic dynamos in magma oceans of Super-Earths

F Soubiran, B Militzer - Nature communications, 2018 - nature.com
Super-Earths are extremely common among the numerous exoplanets that have been
discovered. The high pressures and temperatures in their interiors are likely to lead to long …

Anharmonicity and phase diagram of magnesium oxide in the megabar regime

F Soubiran, B Militzer - Physical Review Letters, 2020 - APS
With density functional molecular dynamics simulations, we computed the phase diagram of
MgO from 50 to 2000 GPa up to 20 000 K. Via thermodynamic integration (TDI), we derive …

Shock response and phase transitions of MgO at planetary impact conditions

S Root, L Shulenburger, RW Lemke, DH Dolan… - Physical Review Letters, 2015 - APS
The moon-forming impact and the subsequent evolution of the proto-Earth is strongly
dependent on the properties of materials at the extreme conditions generated by this violent …

Decaying shock studies of phase transitions in MgO‐SiO2 systems: Implications for the super‐Earths' interiors

RM Bolis, G Morard, T Vinci, A Ravasio… - Geophysical …, 2016 - Wiley Online Library
We report an experimental study of the phase diagrams of MgO, MgSiO3, and Mg2SiO4 at
high pressures. We measured the shock compression response, including pressure …

Melting in super-earths

L Stixrude - … Transactions of the Royal Society A …, 2014 - royalsocietypublishing.org
We examine the possible extent of melting in rock-iron super-earths, focusing on those in the
habitable zone. We consider the energetics of accretion and core formation, the timescale of …

First-principles calculation of entropy for liquid metals

MP Desjarlais - Physical Review E, 2013 - APS
We demonstrate the accurate calculation of entropies and free energies for a variety of liquid
metals using an extension of the two-phase thermodynamic (2PT) model based on a …