Si bcc SW_ZhangXieHu_2014OptimizedSW2_Si__MO_475612090600_004 3.14516343921 Optimization terminated successfully. Current function value: -5.804022 Iterations: 71 Function evaluations: 187 C11 = 839.454194 +/- 0.007336 GPa C12 = 621.002476 +/- 0.005187 GPa C44 = 59.335645 +/- 0.001834 GPa B = 693.819715 +/- 0.004235 GPa