Si bcc ThreeBodyCluster_KP_KaxirasPandey_1988_Si__MO_072486242437_000 3.4185628593 Optimization terminated successfully. Current function value: -7.229022 Iterations: 70 Function evaluations: 183 C11 = 109.987520 +/- 0.007336 GPa C12 = 101.651120 +/- 0.005187 GPa C44 = 2.226929 +/- 0.001834 GPa B = 104.429920 +/- 0.004235 GPa