element: Pb lattice type: fcc modelname: LJ_ElliottAkerson_2015_Universal__MO_959249795837_003 Attempting to perform relaxation using initial lattice constant guess of 2.5 Angstroms Optimization terminated successfully. Current function value: -28.603991 Iterations: 31 Function evaluations: 64 {'lattice_constant': 4.015757858753204, 'cohesive_energy': 7.15099774497176, 'element': 'Pb', 'species': 'Pb" "Pb" "Pb" "Pb', 'crystal_structure': 'fcc', 'space_group': 'Fm-3m', 'wyckoff_code': '4a', 'basis_atoms': '[[0.0 0.0 0.0] [0.5 0.5 0.0] [0.5 0.0 0.5] [0.0 0.5 0.5]]', 'iterations': 31, 'func_calls': 64, 'warnflag': 0, 'repeat': 0}