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Showing 1–11 of 11 results
Advanced filters: Author: Lars Stixrude Clear advanced filters

  • First-principles molecular dynamics driven by density functional theory is used to show that silicate and hydrogen are completely miscible over a wide range of plausible core–envelope pressure–temperature conditions.

    • Travis Gilmore
    • Lars Stixrude
    ResearchOpen Access
    Nature
    Volume: 650, P: 60-64

  • Cooling of the iron core in the early Earth may have been too slow to allow for the generation of a magnetic field. Based on quantum mechanical and geodynamical modelling approaches, the authors find that the electrical conductivity of silicate liquid at high pressure and temperature conditions could have been sufficient to generate a silicate dynamo and a magnetic field in the early Earth.

    • Lars Stixrude
    • Roberto Scipioni
    • Michael P. Desjarlais
    ResearchOpen Access
    Nature Communications
    Volume: 11, P: 1-5

  • Large-scale molecular dynamics simulations show that the crystal–melt interfacial energies of MgSiO3 bridgmanite increase substantially with pressure, potentially forming unusually large bridgmanite crystals and suggesting a new physical mechanism driving magma ocean segregation.

    • Jie Deng
    • Junwei Hu
    • Lars Stixrude
    Research
    Nature
    Volume: 650, P: 361-366

  • The results of first-principles molecular dynamics simulations of hydrous silicate melt is reported, showing that pressure has a profound influence on speciation of the water component. It is inferred that the speciation changes from being dominated by hydroxyls and water molecules at low pressure to extended structures at high pressure. This change in structure is linked to the finding that the water–silicate system becomes increasingly ideal at high pressure, indicating complete miscibility of water and silicate melt throughout almost the entire mantle pressure regime.

    • Mainak Mookherjee
    • Lars Stixrude
    • Bijaya Karki
    Research
    Nature
    Volume: 452, P: 983-986

  • An ultra-low seismic velocity region that may contain unstable mineral phases exists within the cold Pacific slab near the 410-km discontinuity at the Kuril subduction zone, according to analyzes of P-wave travel times and waveforms from dense seismic arrays.

    • Jiaqi Li
    • Thomas P. Ferrand
    • Min Chen
    ResearchOpen Access
    Communications Earth & Environment
    Volume: 4, P: 1-9