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The stability of possible termination structures for the (010) surface offorsterite, $ Mg_2SiO_4 $, is studied using a density functional theory (DFT)based thermodynamic approach. The DFT calculations are used to estimate thesurface Gibbs free energy of various surface structures and compare theirstability as a function of the chemical environment. Among 9 possibleterminations, the SiO-II, M2, O-II terminations are found to be most stable asconditions range from Mg-poor to Mg-rich. This relative stability order remainsthe same at an elevated temperature. The surface phase diagram obtainedprovides ground for further theoretical studies of chemical processes onforsterite surfaces in terrestrial planets.

Density functional theory calculations and thermodynamic analysis of the forsterite $Mg_{2}SiO_{4}$(010) surface