Figure 2

Representative neutron diffraction patterns analyzed using the Rietveld refinement method. (a) Hydrous sample with sulfur at 6.7 GPa and 1000 K (#A349) and (b) hydrous sample without sulfur at 11.6 GPa and 868 K (#A454). “+ ” denotes the observed data points; the solid line red denotes the calculated profile. The difference between the observed (black+) and the calculated (red) profiles (“diff”) is shown as blue lines at the bottom of each plot. Tick marks below the pattern show the positions of allowed diffraction peaks and hkl for the corresponding phases (f; Fe fcc, h; Fe hcp). “Clino En” represents the high-PT phase of enstatite.