Water-like transport property anomalies in liquid silicates investigated at high T and P by computer simulation techniques.

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

Research output: Chapter in Book/Report/Conference proceedingChapter

39 Scopus citations

Abstract

The P-dependence of the liquid structure and diffusion dynamics of Na2O-SiO2 binary solutions and jadeite at 6000 K was studied using a multicomponent ion-dynamics computer simulation. In liquid jadeite, P increases cause sharp increases in the diffusivities of Al, Si and O ions; a maximum diffusivity (implying a minimum viscosity) was found near 300 kbar. For Na+, however, the pressure coefficient is strongly negative. In the binary silicate solutions, there was a decrease in anomalous P-induced increases in diffusivity as Na2O increased. At low P the coordination numbers of Si and Al are both 4, but these increase systematically with increase in P, reaching average values of 5 for Si at approx max. oxygen diffusivity. -R.A.H.

Original languageEnglish (US)
Title of host publicationBulletin de Mineralogie
Pages89-97
Number of pages9
Volume106
Edition1-2
StatePublished - 1983
Externally publishedYes

    Fingerprint

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Environmental Science(all)

Cite this

Angell, C., Cheeseman, P. A., & Tamaddon, S. (1983). Water-like transport property anomalies in liquid silicates investigated at high T and P by computer simulation techniques. In Bulletin de Mineralogie (1-2 ed., Vol. 106, pp. 89-97)