Fig. 6: The evolution of X-ray diffraction patterns along the NiO sample in a non-hydrostatic experiment at different pressures.
From: The first-order structural transition in NiO at high pressure
a X-ray diffraction (XRD) patterns collected in the linear scan along the x-axis with a step of 1 µm at 208 GPa (run5), (b) XRD patterns collected in the same scan at 133 GPa after decompression (run5) (Supplementary Note 3). We clearly observed the splitting of the reflections corresponding to simultaneous measurements of high-pressure (HP) and low-pressure (LP) structures. There is stratification resulting in some regions of pure high- and low-pressure phases at the same pressure value. The scan line crosses the boundary between these two phases. The illustration of stratification of LP and HP phases is shown in panel (c).
