High pressure x-ray diffraction measurements on Mg2SiO4 glass

C. J. Benmore*, E. Soignard, M. Guthrie, S. A. Amin, J. K. R. Weber, K. McKiernan, M. C. Wilding, J. L. Yarger

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

25 Citations (SciVal)

Abstract

The structure factors of Mg2SiO4 glass have been measured using high energy x-ray diffraction up to pressures of 30.2 GPa, and the equation of state measured up to 12.8 GPa. The average Mg-O coordination numbers were extracted from the experimental pair distribution functions assuming two cases (i) there is no change in Si-O coordination number with pressure and (ii) the average Si-O coordination number increases the same as for pure SiO2 glass. Both analyses give similar results and show a gradual increase in the average Mg-O coordination number from 5.0 at ambient pressure to similar to 6.6(6) at 30.2 GPa. There is good qualitative agreement between the experimental structure and equation of state data for the glass compared to several recent molecular dynamics simulations carried out on liquid Mg2SiO4. (C) 2011 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)2632-2636
Number of pages5
JournalJournal of Non-Crystalline Solids
Volume357
Issue number14
Early online date10 Feb 2011
DOIs
Publication statusPublished - 01 Jul 2011
Event11th International Conference on the Structure of Non-Crystalline Materials (NCM 11) - Paris, France
Duration: 28 Jun 201002 Jul 2010

Keywords

  • SCATTERING
  • Equation of state
  • High pressure
  • DISCONTINUITY
  • MELT
  • X-ray diffraction
  • LIQUID
  • FORSTERITE MG2SIO4
  • MANTLE
  • ATOP
  • MOLECULAR-DYNAMICS
  • Silicate glass
  • Glass structure

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