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

The behavior of the thermal pressure, P TH , in MgO and MgSiO 3  perovskite is investigated at lower mantle conditions using first-principles lattice dynamical calculations based on density functional perturbation theory. In both cases, P TH  is a slowly varying function of volume: it decreases linearly with compression at low temperatures but shows a slight non monotonical trend at high temperatures. Because P TH  strongly increases with increasing temperature, its volume-induced variations at high temperatures (above 1000 K) can be neglected to a good approximation. It is possible to estimate the thermal equations of state of these minerals at typical lower mantle temperatures only with the knowledge of the measured P TH  vs. temperature data at ambient pressure and isothermal compression data at ambient temperature. The coefficient of thermal expansion for MgO at high pressures and temperatures obtained in this manner agrees well with the first-principles predictions and available experimental data.

Thermal pressure in MgO and MgSiO 3 perovskite at lower mantle conditions