Si fcc SW_ZhangXieHu_2014OptimizedSW1_Si__MO_800412945727_004 3.88695470989 Warning: Maximum number of function evaluations has been exceeded. C11 = 665.683211 +/- 0.007336 GPa C12 = 693.902904 +/- 0.005187 GPa C44 = 89.015770 +/- 0.001834 GPa B = 684.496340 +/- 0.004235 GPa