Chemical Stability of Ferropericlase in Volatile-rich Super-Earths

Ferropericlase [(Mg,Fe)O, Fp] are supposed to be the most abundant oxide mineral in super-Earths. However, the chemical stability of Fp in the deep interiors of volatile-rich super-Earths is still unknown. Here we plan to examine the stability field of Fp and possible reactions of Fp with water in the mantles of super-Earths (up to 300 GPa and 4000 K) with nanotwinned diamond anvil cells and X-ray diffraction. Our findings are vital for the mineralogical model of volatile-rich super-Earths.