First-principles calculations of the structural and elastic properties of OsSi2 at high pressure

► We investigated the pressure dependence of the structural and elastic properties of OsSi2 in the range 0-60 GPa using first-principles calculations based on density functional theory. ► The elastic constants, isotropic bulk modulus, shear modulus, Young's modulus, Poisson's ratio, elastic anisotropy, and Debye temperature of polycrystalline OsSi2 under pressure are presented.