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  1. 30 gru 2014 · Combined synthesis experiments and first-principles calculations show that MgSiO 3 -perovskite with minor Al or Fe does not incorporate significant OH under lower mantle conditions.

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  4. Both Al and Fe3+ substitute on the octahedral site, and charge balance occurs through the removal of Si. The degree of Mg/Si ordering on the octahedral sites in (Mg,Fe)SiO3 majorite, which affects both the c/a ratio and the unit cell volume, is influenced by the thermal history of the sample.

  5. Combined synthesis experiments and first-principles calculations show that MgSiO3-perovskite with minor Al or Fe does not incorporate significant OH under lower mantle conditions.

  6. 1 gru 2012 · Along the Pyr–Alm, (Mg, Fe) 3 Al 2 Si 3 O 12, join from Alm38 to Alm100, we find that single-phase perovskites can be synthesized from garnet starting materials at 70–90 GPa and 2000–2500 K, corresponding to deep lower mantle pressure/temperature conditions.

  7. 30 lis 2007 · We finally investigated pyrope and an Al–(Mg,Fe)SiO 3 composition relevant to subducted mid-ocean ridge basalts (MORBs). We purposely restrained our investigation of the compression of aluminous perovskite in the stability field of this phase.

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