Fig. 4: The Pressure–temperature (P–T) phase diagram of the Xe-FeO2 system.
From: Xenon iron oxides predicted as potential Xe hosts in Earth’s lower mantle
The dotted and dashed lines indicate phase boundaries and temperature-driven phase instability, which are determined by Gibbs free energy and ab initio molecular dynamics (AIMD) calculations, respectively. The square symbols show phase transition points based on relative Gibbs free energy, and the solid and open triangle symbols represent stable and temperature-driven unstable solid phases, respectively, determined by AIMD simulations. The P–T regions of stable Xe2FeO2 are covered by slash lines and the P–T regions of stable XeFe3O6 are filled by back-slash. The pressure boundary between the lower mantle and the core is shown at the top of the figure. Also shown is the geotherm of the Earth’s interior65.
