Extended Data Figure 2: Examples of the full-profile (GSAS) treated diffraction patterns.
From: The most incompressible metal osmium at static pressures above 750 gigapascals
a, Au–Pt mixture collected in a dsDAC at 482(5) GPa (Au pressure scale from ref. 20). Even at pressures in the proximity of 5 Mbar, powder X-ray diffraction data are sufficient to clearly resolve peaks of Au and Pt, and accurately determine lattice parameters of both metals. b, W–Pt mixture, unsuccessful experiment in a dsDAC. According to the W EOS, the pressure is 461(7) GPa, whereas according to the Pt EOS, it is 559(10) GPa. This inconsistency in pressures is a result of an inhomogeneous distribution of the two metals between secondary anvils in the dsDAC; such data cannot be used for constraining EOSs. This observation also shows that very large pressure gradients are possible in dsDACs. c, Mixture of Os (a = 2.5404(6) Å, c = 4.0386(10) Å), W (a = 2.9133(5) Å), and Au (a = 3.6657(6) Å) collected in a conventional DAC (Ne used as the pressure transmitting medium) at a pressure of 134(2) GPa.
