Figure 2.

Pressure dependencies of elastic moduli for MgO. Symbols with error bars are the present data points and solid curves are polynomial fittings of this study, with pressures determined by the present MgO scale. Third- and fourth-order Birch–Murnaghan equation of state fits are shown for K_S and G_S, respectively. Open squares represent the fit to the Brillouin scattering data of Sinogeikin and Bass (25); double dot–dashed curves are extrapolations of ultrasonic data (8); and dot–dashed curves are from theoretical calculations (37).