Figure 4.

Synchrotron X-ray diffraction patterns of nano (left panel) and micron Ni (right panel) at 298 K and selected pressure conditions, obtained from a single high-pressure experiment. The patterns plotted are from the experiment at pressures up to 6.05 GPa (i.e., after the bulk yielding of samples), with the blue and dark-red colors indicating compression and decompression, respectively. The peak intensities of the hkl diffractions are normalized relative to that of (111) at ambient conditions for width comparison purpose