Equation of state of the NaCl-B2 phase up to 304 GPa

We compressed NaCl-B2 to 304 GPa and presented a pressure scale based on the Birch–Murnaghan and Vinet equations of state for this phase. The pressure difference between the two formulations of the equation of state was less than 2.0% within the pressure range of 50–364 GPa. The present data indicates that the uniaxial stress of the platinum used in the sample is 2.4 GPa and comparable with that of runs using a helium pressure medium. The compression curve of NaCl-B2 was expressed by the Birch–Murnaghan equation of state with fixed volume at ambient pressure, where V0 = 37.73(4.05) Å3, K = 47.00(46) GPa and K′ = 4.10(2) based upon Matsui et al.’s platinum scale.