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Title: Magnesium oxide at extreme temperatures and pressures studied with first-principles simulations

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.5126624· OSTI ID:1633879

We combine two first-principles computer simulation techniques, path integral Monte Carlo and density functional theory molecular dynamics, to determine the equation of state of magnesium oxide in the regime of warm dense matter, with densities ranging from 0.35 to 71 g cm-3 and temperatures ranging from 10 000 K to 5 × 108 K. These conditions are relevant for the interiors of giant planets and stars as well as for shock wave compression measurements and inertial confinement fusion experiments. We study the electronic structure of MgO and the ionization mechanisms as a function of density and temperature. We show that the L-shell orbitals of magnesium and oxygen hybridize at high density. This results in a gradual ionization of the L-shell with increasing density and temperature. In this regard, MgO behaves differently from pure oxygen, which is reflected in the shape of the MgO principal shock Hugoniot curve. The curve of oxygen shows two compression maxima, while that of MgO shows only one. We predict a maximum compression ratio of 4.66 to occur for a temperature of 6.73 × 107 K. Lastly, we research how multiple shocks and ramp waves can be used to cover a large range of densities and temperatures.

Research Organization:
Univ. of California, San Diego, CA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)
Grant/Contract Number:
NA0003842; SC0016248; AC52-07NA27344
OSTI ID:
1633879
Alternate ID(s):
OSTI ID: 1576664; OSTI ID: 1669248
Report Number(s):
LLNL-JRNL-813897; TRN: US2201255
Journal Information:
Journal of Chemical Physics, Vol. 151, Issue 21; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 12 works
Citation information provided by
Web of Science

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Cited By (2)

Equation of State of Hot, Dense Magnesium Derived with First-PrinciplesComputer Simulations text January 2020
First-Principles Equation of State Database for Warm Dense Matter Computation text January 2020