Figure 5.

(a, d, g) Integrated XRD data collected from a sample of Au and Ne, illustrating the experimental procedure followed during a typical dDAC experiment. First, a heating test is performed at a given X-ray transmission (here 0.8%) to assess the extent of X-ray heating without compressing the sample [panels (a)–(c)]. If the temperature increase is too large, the heating test is repeated at a lower X-ray transmission [panels (d)–(f) at 0.3%] until the temperature rise is deemed acceptable for the experiment. Data are then collected using an appropriate X-ray transmission (here 0.3%) as the sample is compressed [panel (g)], and the pressure is determined based on the unit cell volume of the sample or pressure marker [panels (h) and (i)]. Pressure and temperature are determined assuming (c, f) isobaric and (i) isothermal conditions using the EoS of Au (Anderson et al., 1989 ▸).