Si fcc SW_BalamaneHauchShi_2017Brittle_Si__MO_381114941873_002 4.32650376111 Optimization terminated successfully. Current function value: -10.807001 Iterations: 73 Function evaluations: 193 C11 = 850.771618 +/- 0.007336 GPa C12 = 927.786023 +/- 0.005187 GPa C44 = 96.233051 +/- 0.001834 GPa B = 902.114554 +/- 0.004235 GPa