Fig. 5: The X-ray diffraction patterns of NiO in non-hydrostatic experiment in the megabar pressure range.
From: The first-order structural transition in NiO at high pressure

a The evolution of X-ray diffraction (XRD) patterns of NiO in run5 with pressure increase below the structural transition. b The evolution of XRD patterns of NiO in run5 with pressure increase in the region of structural transition (181–212 GPa).