element: F lattice type: fcc modelname: Sim_LAMMPS_EIM_Zhou_2010_BrClCsFIKLiNaRb__SM_259779394709_001 Attempting to perform relaxation using initial lattice constant guess of 2.5 Angstroms Optimization terminated successfully. Current function value: -3.277230 Iterations: 32 Function evaluations: 64 {'lattice_constant': 5.4537331983447075, 'cohesive_energy': 0.8193075477307331, 'element': 'F', 'species': 'F" "F" "F" "F', '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': 32, 'func_calls': 64, 'warnflag': 0, 'repeat': 0}