Pressure enhancement of ion mobilities in liquid silicates from computer simulation studies to 800 kilobars.

C. A. Angell, P. A. Cheeseman, S. Tamaddon

Research output: Contribution to journalArticle

166 Scopus citations

Abstract

Ion dynamics computer simulations have been applied successfully to silicate and borate glasses as well as MgSiO3 and Mg2SiO4. Many liquid silicates, like silica itself, have component diffusion coefficients that show anomalous P dependences. Diffusivity maxima occur at P = 200-300 kbar and are correlated with a prevalence of five-fold coordination of silicon ions. The authors speculate that the interior viscosity of a molten silica-rich planetary body would be much smaller than the viscosity at the surface, since it seems that (at least to P = 150 kbar), increasing P acts in the same way as increasing T to decrease viscosity. For silica-poor liquids (such as the Earth's mantle) P and T act in opposite directions at all P, giving less dependence of viscosity with depth in a primitive, molten planetary body. -E.O.

Original languageEnglish (US)
Pages (from-to)885-887
Number of pages3
JournalScience
Volume218
Issue number4575
DOIs
StatePublished - Jan 1 1982
Externally publishedYes

ASJC Scopus subject areas

  • General

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