Compressibility of FeSi between 0 and 9 GPa, determined by high pressure time-of-flight neutron powder diffraction

The cell parameter of cubic iron monosilicide, epsilon -FeSi, has been determined at 25 pressures between 0 and 9 GPa by time-of-flight neutron powder diffraction, using the POLARIS diffractometer at the ISIS spallation neutron source. NaCl was used as an internal pressure standard. Fitting of the data to a third-order Birch-Murnaghan equation of state with K ' 0 fixed at a value of 4.0 gave an isothermal bulk modulus K 0 , of 160(1) GPa.