MgSiO3 perovskite is the most abundant mineral in the Earth’s lower mantle. A structural phase transition in this phase to a CaIrO3-type polymorph was discovered in 2004 (Murakami et al. 2004; Oganov and Ono 2004; Tsuchiya et al. 2004). This new polymorph, the so-called post-perovskite (PPV) phase, was produced at pressures and temperatures close to those expected at the core-mantle boundary, 125 GPa and 2,500 K (Murakami et al. 2004). In the Earth, the PPV phase is the final form of MgSiO3. This surprising discovery invited a new question:...

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