Si fcc SW_HauchHollandMarder_1999Brittle_Si__MO_119167353542_005 4.326503738760948 Optimization terminated successfully. Current function value: -10.121702 Iterations: 74 Function evaluations: 193 C11 = 796.822116 +/- 0.007336 GPa C12 = 868.952849 +/- 0.005187 GPa C44 = 90.130681 +/- 0.001834 GPa B = 844.909272 +/- 0.004235 GPa