Abstract
From ab initio evolutionary algorithm, we predict a new high pressure phase transition of Mg2SiO4 (Forsterite) above 30 GPa. At this pressure, Forsterite changes into post-spinel structure with Pbam space group. This structure has attracted the interest of many previous works, but which have not been definitively conclusive. Forsterite is stabilized under further phase transition at 64.5 GPa. Above this pressure, the structure with Cmc21 space group becomes the most stable.
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