title: (Mg,Fe)SiO3-perovskite stability under lower mantle conditions
abstract: In three different experiments up to 100 gigapascals and 3000 kelvin, (Mg,Fe)SiO3-perovskite, the major component of the lower mantle, remained stable and did not decompose to its component oxides (Mg, Fe)O and SiO2. Perovskite was formed from these oxides when heated in a diamond anvil cell at pressures up to 100 gigapascals. Both MgSiO3 crystals and glasses heated to 3000 kelvin at 75 gigapascals also formed perovskite as a single phase, as evident from Raman spectra. Moreover, fluorescence measurements on chromium-doped samples synthesized at these conditions gave no indication of the presence of MgO.
authors.affiliation: Max-Planck-Institut fur Chemie, Postfach 3060, 55020 Mainz, Germany.
authors.initials: G
authors.lastname: Serghiou
authors.initials: A
authors.lastname: Zerr
authors.initials: R
authors.lastname: Boehler