The 4th International Conference on Matter and Radiation at Extremes (ICMRE 2019)

586 / 2019-03-20 22:33:51

Equation of state and phase diagram of 4H-silicon carbide investigated by laser shock compression

equation of state, phase diagram, silicon carbide, shock compression

Plenary track > High Pressure Physics and Materials Science

The equations of state and phase diagram of a fundamental component of planets like silicon carbide is important for building planetary interior models. In this work, the shock Hugoniot states of 4H-silicon carbide single crystal are produced by laser shock compression. The shock velocity is monitored using a velocity interferometer system and the optical emission is collected by a streak optical pyrometer. The experimental Hugoniot data, as well as the theoretical 0-K equation of state data, helps us to construct a more accurate Gruneisen equation of state model. According to this model and the Lindermann relation, a high pressure phase diagram of 4H-silicon carbide can be established.