Rn fcc LJ_ElliottAkerson_2015_Universal__MO_959249795837_003 4.125791251659393 Optimization terminated successfully. Current function value: -0.715915 Iterations: 75 Function evaluations: 198 C11 = 18.651401 +/- 0.007336 GPa C12 = 10.641445 +/- 0.005187 GPa C44 = 10.663563 +/- 0.001834 GPa B = 13.311430 +/- 0.004235 GPa