Si diamond ThreeBodyBondOrder_PPM_PurjaPunMishin_2017_Si__MO_566683736730_000 5.43356013298 Optimization terminated successfully. Current function value: -37.039999 Iterations: 70 Function evaluations: 185 C11 = 172.572571 +/- 0.007336 GPa C12 = 64.571105 +/- 0.005187 GPa C44 = 81.271409 +/- 0.001834 GPa B = 100.571594 +/- 0.004235 GPa