Isothermal Equations of State of LLM-105

2,6-diamino-3,5-dinitropyrazine-1-oxide (LLM-105) is an energetic ingredient that has an impact sensitivity close to that of TATB, yet a calculated energy content close to HMX. Reported tests of formulated LLM-105 reveal that it is a good candidate for a new insensitive high-performance explosive. As use of LLM-105 increases, thermodynamic parameters and phase stability will need to be determined for accurate modeling. In order to accomplish this goal, isothermal equations of state of LLM-105 at static high pressure and temperature were investigated using synchrotron angle-dispersive x-ray diffraction experiments. The samples were compressed and heated using diamond anvil cells. Pressure - volume data for LLM-105 at ambient temperature and 100$^{\circ}$C were fit to the Birch-Murnaghan formalism to obtain isothermal equations of state. Temperature - volume data at ambient pressure were fit to obtain the volume thermal expansion coefficient.