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Showing 1–11 of 11 results
Advanced filters: Author: Sang-Heon Shim Clear advanced filters

  • In 2004, a phase transition was discovered in the most abundant lower-mantle mineral. A decade of focused experiments, computations and seismic imaging stimulated by this discovery has revealed previously unknown complexities in Earth's deep mantle.

    • Sang-Heon Shim
    • Thorne Lay
    News & Views
    Nature Geoscience
    Volume: 7, P: 621-623

  • Seismic detectability of the boundaries and convection in the mantle is strongly influenced by the thicknesses and Clapeyron slopes of mantle phase boundaries. The unusually large positive Clapeyron slope found for the boundary between perovskite and post-perovskite (the 'pPv boundary') would destabilize high-temperature anomalies in the lowermost mantle, in disagreement with the seismic observations. Here, new studies of the thickness and Clapeyron slope of the pPv boundary shed light on this matter.

    • Krystle Catalli
    • Sang-Heon Shim
    • Vitali Prakapenka
    Research
    Nature
    Volume: 462, P: 782-785

  • Investigations of the crystallization of FeSi in Fe–Si–H melt under high pressure−temperature conditions provide evidence of a new process that explains geochemical and geophysical observations at the core–mantle boundary.

    • Suyu Fu
    • Stella Chariton
    • Sang-Heon Shim
    Research
    Nature
    Volume: 615, P: 646-651

  • Experiments show that calcium solubility in bridgmanite increases with depth in Earth’s lower mantle, resulting in the disappearance of CaSiO3 perovskite and indicating a transition from a two-perovskite to a single-perovskite domain.

    • Byeongkwan Ko
    • Eran Greenberg
    • Sang-Heon Shim
    Research
    Nature
    Volume: 611, P: 88-92

  • Under the pressure of a watery ocean, rock-forming minerals might dissolve at a planet’s rock–water interface, generating a denser-than-water layer that should be incorporated into models. The experimental data for MgO presented here are relevant to water-rich Earth-sized planets such as TRAPPIST-1 c and f, and to Uranus.

    • Taehyun Kim
    • Stella Chariton
    • Yongjae Lee
    Research
    Nature Astronomy
    Volume: 5, P: 815-821

  • The study of water at high pressure and temperature is essential for understanding planetary interiors but is hampered by the high reactivity of water at extreme conditions. Here, indirect X-ray laser heating of water in a diamond anvil cell is realized via a gold absorber, showing no evidence of reactivity.

    • Rachel J. Husband
    • R. Stewart McWilliams
    • Hanns-Peter Liermann
    ResearchOpen Access
    Communications Materials
    Volume: 2, P: 1-9