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 α _(0,T) = a_(0) + a_(1) × (T ? 300).