Theoretical and experimental evidence for a post-perovskite phase of MgSiO3 in Earth's D″ layer

  title={Theoretical and experimental evidence for a post-perovskite phase of MgSiO3 in Earth's D″ layer},
  author={Artem R. Oganov and Shigeaki Ono},
The Earth's lower mantle is believed to be composed mainly of (Mg,Fe)SiO3 perovskite, with lesser amounts of (Mg,Fe)O and CaSiO3 (ref. 1). But it has not been possible to explain many unusual properties of the lowermost ∼150 km of the mantle (the D″ layer) with this mineralogy. Here, using ab initio simulations and high-pressure experiments, we show that at pressures and temperatures of the D″ layer, MgSiO3 transforms from perovskite into a layered CaIrO3-type post-perovskite phase. The elastic… CONTINUE READING
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