Si fcc SW_StillingerWeber_1985_Si__MO_405512056662_006 4.146581918001175 Optimization terminated successfully. Current function value: -15.760531 Iterations: 77 Function evaluations: 203 C11 = 691.969483 +/- 0.007336 GPa C12 = 730.771813 +/- 0.005187 GPa C44 = 87.438250 +/- 0.001834 GPa B = 717.837703 +/- 0.004235 GPa