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• W4298091267 abstract "Al 2 O 3 is estimated to total 4 to 5 mol% in all mantle compositional models, and is believed to be incorporated into (Mg,Fe)SiO 3 ‐perovskite at lower mantle conditions. Using synchrotron X‐ray diffraction, we have measured the 300 K equation of state of a perovskite with X Al =Al/(Al+Mg+Si)=.077, up to 32 GPa. A least squares refinement of two independent data sets yields the following equation of state parameters V 0 =163.52(3) ų, K 0 =229(4) GPa, and K 0 =2.5(4). These values allow us to assess the most probable substitution mechanism for aluminium into perovskite at pressure conditions of the shallow lower mantle. Al 3+ is likely to be incorporated in place of Si 4+ in the octahedral site of perovskite, hence requiring the creation of oxygen vacancies for charge balance. As a consequence, aluminous perovskites may have a high affinity for water. The enhanced compressibility of aluminous perovskite certainly has also strong geophysical and geochemical implications, as it may revive perovskite‐rich lower mantle models." @default.
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• W4298091267 date "2001-10-01" @default.
• W4298091267 modified "2023-10-16" @default.
• W4298091267 title "Equation of state of Al‐bearing perovskite to lower mantle pressure conditions" @default.
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• W4298091267 doi "https://doi.org/10.1029/2001gl013011" @default.
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