Nb bcc MEAM_LAMMPS_YangQi_2019_Nb__MO_360068930164_001 3.322380468249321 Optimization terminated successfully. Current function value: -13.994603 Iterations: 73 Function evaluations: 192 C11 = 249.470280 +/- 0.007336 GPa C12 = 134.754428 +/- 0.005187 GPa C44 = 21.230295 +/- 0.001834 GPa B = 172.993046 +/- 0.004235 GPa