Pressure-driven change to the Mg and Al coordination environments in silicate glass
Mg and Al are two essential elements in materials that range from commercial display glass to the glasses used as models for dry basaltic melts. There is great interest in the structural response of these glasses to pressure, but little is known from in situ experiments. We will address this issue by using neutron diffraction to investigate a prototypical magnesium aluminosilicate glass at pressures up to 8 GPa. Here, the method of Mg isotope substitution will be employed to give site-specific information on both the Mg and Al coordination environments. The results will reveal, for the first time, the nature of the structural changes that take place. They will then be used to test the validity of atomic interaction models that are being developed for molecular dynamics simulations. By establishing the correct theoretical ingredients for reproducing the experimental results, these models will become transferable. This capability will enable accurate predictions for the pressure-dependent structure and properties of materials with different compositions.
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SALMON Philip Stephen; Henry E. Fischer; Rita Silva; Hesameddin Mohammadi and ZEIDLER Anita. (2021). Pressure-driven change to the Mg and Al coordination environments in silicate glass. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.6-05-1015
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