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- W1971920840 abstract "We have determined the equation of state of a hexagonal Al-rich type NAL phase [K0.07Na0.81Ca0.12]Σ1.01[Mg1.62Fe0.38]Σ2.00[Al4.98Fe0.10Ti0.05Si0.88]Σ6.01O12, an aluminum host mineral that is likely to occur in subducted oceanic crusts (mid-oceanic ridge basaltic (MORB)) in the Earth’s lower mantle. Angle-dispersive X-ray powder diffraction experiments were conducted up to 36 GPa at room temperature at the BL04-B2 at Spring-8. Fitting a third-order Birch–Murnaghan equation of state to the data gives a bulk modulus of K0=214(±2) GPa with K0′=3(±0.1), a volume V0=184.55(6) Å3 and a zero-pressure density of ρ0=4 g/cm3. When K0′ is fixed at 4, the value of K0=202.3(±0.9) GPa. These values are comparable to those for similar anhydrous hexagonal aluminous phases reported previously by Ono et al. [Phys. Chem. Minerals 29 (2002a) 527]. The density of NAL phase is lower than that of other minerals (excluding the CF phase) co-existing in the subducted oceanic crust, such as Mg-perovskite, Ca-perovskite and stishovite. We find that the elastic properties of the hexagonal Al-rich phase do not change despite substantial variations in Si, Al, Fe, Mg, Na and K content in the NAL chemical composition." @default.
- W1971920840 created "2016-06-24" @default.
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- W1971920840 date "2003-08-01" @default.
- W1971920840 modified "2023-09-27" @default.
- W1971920840 title "The compressibility of hexagonal Al-rich NAL phase: similarities and differences with calcium ferrite-type (CF) phase with implications for the lower mantle" @default.
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- W1971920840 doi "https://doi.org/10.1016/s0031-9201(03)00155-9" @default.
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