Local structure and density of (Mg,Fe)SiO3 glasses up to 250 GPa

Physical properties of liquid silicates under extreme conditions are of first importance in geophysics, to constrain the early molten stage as well as to understand the seismic anomalies detected nowadays at the Earth's Core-Mantle Boundary. It is however extremely challenging to measure accurate melt structure over 100 GPa, therefore the analogy with compressed glass is often used.
Thanks to the unique capabilities of ID27 High pressure beamline (Multichannel collimator and high brilliance pink beam), our group would like to measure precise structure factor of (Mg,Fe)SiO3 glass up to 250 GPa, to understand the effect of Fe on density and local structure of glass. This dataset will be finally compared with recent XRD data of laser shocked liquid silicates patterns recorded at LCLS, in order to assess analogy and differences betweeen liquid and amorphous silicates.