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 V-0 = 37.73(4.05) angstrom(3), K = 47.00(46) GPa and K' = 4.10(2) based upon Matsui et al.'s platinum scale. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3573393]