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- W2009574023 abstract "Enthalpy for MgSiO 3 orthopyroxene‐perovskite transition at 298 K was measured by differential drop‐solution calorimetry. Based on four measurements of MgSiO 3 perovskite, the ΔH° 298 of 102.2±2.5 kJ/mol was more precisely determined than that in the previous study. The enthalpies of transitions from MgSiO 3 ilmenite to perovskite and from Mg 2 SiO 4 spinel to perovskite + periclase were calculated to be 43.2±5.0 and 86.1±3.6 kJ/mol, respectively. The boundaries of these transitions were calculated using the above data together with physical properties of relevant phases, including recently determined properties of perovskite: heat capacity, entropy, and temperature dependence of bulk modulus. The calculated P‐T slopes for the ilmenite‐perovskite transition and the spinel dissociation are −3.4±2 and −3±1 MPa/K, respectively. The latter slope may suggest that the upper and lower mantle convect separately but intermittent mixing occurs between them." @default.
- W2009574023 created "2016-06-24" @default.
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- W2009574023 date "1993-09-03" @default.
- W2009574023 modified "2023-10-15" @default.
- W2009574023 title "Refinement of enthalpy measurement of MgSiO<sub>3</sub> perovskite and negative pressure‐temperature slopes for Perovskite‐forming reactions" @default.
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- W2009574023 doi "https://doi.org/10.1029/93gl01265" @default.
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