Development of Multiphase EOS Table for Gallium

We present a multiphase equation of state (EOS) table created at Lawrence Livermore National Laboratory for Gallium (Ga). Gallium is an interesting material as it has a low melting temperature of only a few degrees above room temperature, and the Ga-I solid, found at room temperature and pressure, exhibits the properties of both covalent and metallic bonding. Gallium is unusual in that its liquid phase is more dense than the Ga-I solid, leading to a melt line of negative slope. Our EOS captures the anomalous behavior of the liquid phase as well as the three commonly known solid phases, Ga-I, Ga-II, and Ga-III. The table is constrained by published experimental data such as DAC, isobars, and Hugoniot measurements. In addition, we plan to test our EOS against the newest dynamic measurements taken at the Z facility at Sandia National Laboratory.