The equation of state and the unit cell parameters of triamino-trinitrobenzene (TATB) have been measured up to 66 GPa by x-ray diffraction on multi-grain samples. A custom indexing of the diffraction pattern was implemented to enable an unambiguous assignment of the diffraction peaks. The structural data reveal a more isotropic response to compression above 10 GPa, indicating that the van der Waals forces are no more the dominant interplanar interactions. The unit cell parameters are compared with density functional theory calculations, including the empirical D2 correction for the van der Waals interactions. An excellent agreement is obtained up to 20 GPa and an increasing deviation above. The present determination of the TATB isothermal equation of state is reliable for detonation physics applications.
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