Pressure-volume-temperature equation of state of ε-FeOOH to 11 GPa and 700 K

摘要

A new synchrotron X-ray diffraction study of ε-FeOOH has been carried out to determine the pressure-volume-temperature (P-V-T) equation of state (EOS). The P-V-T data fitted a third-order Birch-Murnaghan EOS yielded: isothermal bulk modulus K_(T0) of 135(3) GPa; its pressure derivative K' of 6.1(9); (∂K_T/∂T)_P of -0.05(2) GPa K~(-1); a_0 of 2.6(7) × 10~(-5) K~(-1) and a_1 of 1.0(3) × 10~(-7) K~(-2), where the volumetric thermal expansion coefficient is described as a_(0,T) = a_0 + a_1 × (T - 300).