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- W1996781327 abstract "[1] We report in situ angle-dispersive X-ray diffraction measurements for MgSiO3 at 90–118 and 135–144 GPa and 300–2900 K. At 90–144 GPa, we observed a new diffraction peak at 2.57–2.62 A as reported in Shim et al. [2001]. The pressure-induced position shift of the new peak is consistent with those of MgSiO3 perovskite (Mg-Pv), supporting that the new peak is associated with a modification in crystal structure of Mg-Pv at 88 GPa. During laser heating above 2500 K at 144 ± 10 GPa, in addition to peaks of Mg-Pv, we observed new peaks as well as peak splittings and intensity changes of some peaks. The major features in the diffraction patterns can be explained by the modified Mg-Pv proposed by Shim et al. [2001] together with the post-perovskite phase proposed by Murakami et al. [2004]. This supports the existence of a major phase transition in MgSiO3 under conditions close to those at the base of Earth's mantle." @default.
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- W1996781327 date "2004-05-01" @default.
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- W1996781327 title "Stability and crystal structure of MgSiO<sub>3</sub>perovskite to the core-mantle boundary" @default.
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- W1996781327 doi "https://doi.org/10.1029/2004gl019639" @default.
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