Equations of state of MgO and ε Fe under static pressure conditions

Abstract

The volume equations of state for MgO and ε Fe determined under calibrated static pressure conditions to 1 Mbar are given by V / V 0 = [1 + 2.85(3) P (Mbar)] −0.219(3) (for MgO) where V 0 = 11.25(2) cm 3 /mol and V (cm 3 /mol) = 6.74(3)[1 + 3.4(3)P(Mbar)] −0.185(7) (for ε Fe). The random error of V is 0.3%, and the maximum systematic error of V (caused by the uncertainty of the pressure scale) is 1%. These equations can be employed in geophysical models of the mantle‐core boundary.