Finite strain studies of single crystal iron phosphide under high pressures.

摘要

Fe3P (synthetic schreibersite) is a phosphide occurring in iron alloys. Phosphorous is often considered an undesired impurity causing brittleness. Conversely, in some cases the addition of iron phosphides to certain materials is beneficial (e.g.properties of certain frictional materials are enhanced). In terrestrial rock, we do not find Fe3P, although ( Fe;Ni)3P (natural schreibersite) is found in nearly all iron-containing meteorites. In this project, we examine the unit cell parameters of Fe3P as function of pressure and derive the respective axial and bulk compressibilities. Both Vinet and Birch-Murnaghan formulations were used to relate pressure and unit cell volume, and a comparison of each prediction was made. Comparing to independent data collected up to 62 GPa, no structural phase transitions were observed, and the sample remained in a strained state after relieving applied pressure.