English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We combine two first-principles computer simulation techniques, path integralMonte-Carlo and density functional theory molecular dynamics, to determine theequation of state of magnesium oxide in the regime of warm dense matter, withdensities ranging from 0.35 to 71~g$\,$cm$^{-3}$ and temperatures from 10,000 Kto $5\times10^8$~K. These conditions are relevant for the interiors of giantplanets and stars as well as for shock wave compression measurements andinertial confinement fusion experiments. We study the electronic structure ofMgO and the ionization mechanisms as a function of density and temperature. Weshow that the L-shell orbitals of magnesium and oxygen hybridize at highdensity. This results into a gradual ionization of the L-shell with increasingdensity and temperature. In this regard, MgO behaves differently from pureoxygen, which is reflected in the shape of the MgO principal shock Hugoniotcurve. The curve of oxygen shows two compression maxima, while that of MgOshows only one. We predict a maximum compression ratio of 4.66 to occur for atemperature of 6.73 $\times 10^7$ K. Finally we study how multiple shocks andramp waves can be used to cover a large range of densities and temperatures.

Magnesium Oxide at Extreme Temperatures and Pressures Studied with First-Principles Simulations