Feasibility of in situ neutron diffraction studies of non-crystalline silicates up to pressures of 25 GPa

Martin C. Wilding, Malcolm Guthrie, Craig L. Bull, Matt G. Tucker, Paul F. McMillan

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20 Citations (SciVal)

Abstract

There is an increasing interest in the structural modifications found in liquids and amorphous systems as a function of pressure. Neutron diffraction is a key technique for determining these structures, but its application in high pressure studies remains in its infancy. Recent developments now permit in situ neutron scattering studies of amorphous materials to very high pressure conditions. Here we present new data for MgO–SiO2 and SiO2 glasses collected at up to 8.6 and 24 GPa respectively, using two distinct high pressure anvil geometries. The data collected on the MgO–SiO2 system appear to be reliable, and suggest strong changes in the chemical ordering. In contrast, the higher pressure SiO2 data highlight significant difficulties in performing appropriate corrections for pressure-dependent background and attenuation effects. These challenges are discussed, and future improvements to the technique are proposed.
Original languageEnglish
Article number244122
Number of pages7
JournalJournal of Physics: Condensed Matter
Volume20
Issue number24
Early online date29 May 2008
DOIs
Publication statusPublished - 18 Jun 2008
EventEuropean-Science-Foundation Exploratory Workshop on Glassy Liquids Under Pressure - Ustron, Poland
Duration: 10 Oct 200712 Oct 2007

Keywords

  • COORDINATION CHANGES
  • TEMPERATURES
  • SIO2 GLASS
  • TRANSITION
  • X-RAY-DIFFRACTION
  • POLYAMORPHISM
  • PARIS-EDINBURGH CELL
  • MOLECULAR-DYNAMICS
  • POWDER DIFFRACTION
  • LIQUID SILICA

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