Po diamond LJ_ElliottAkerson_2015_Universal__MO_959249795837_003 6.22649615258 Warning: Maximum number of function evaluations has been exceeded. C11 = -3411281.510931 +/- 0.007336 GPa C12 = 153.875710 +/- 0.005187 GPa C44 = -1279304.227096 +/- 0.001834 GPa B = -1136991.253170 +/- 0.004235 GPa