Si bcc ThreeBodyCluster_Gong_Gong_1993_Si__MO_407755720412_000 3.0538290590047836 Optimization terminated successfully. Current function value: -12.376115 Iterations: 71 Function evaluations: 187 C11 = 789.860000 +/- 0.007336 GPa C12 = 646.985901 +/- 0.005187 GPa C44 = 369.121587 +/- 0.001834 GPa B = 694.610600 +/- 0.004235 GPa