Ar diamond Morse_SigmoidalSmoothed_Jelinek_1972_Ar__MO_071460865933_002 8.513966366648674 Optimization terminated successfully. Current function value: -0.000159 Iterations: 81 Function evaluations: 216 C11 = 0.000220 +/- 0.007336 GPa C12 = 0.000307 +/- 0.005187 GPa C44 = 0.000307 +/- 0.001834 GPa B = 0.000278 +/- 0.004235 GPa