element: Sn lattice type: bcc modelname: MEAM_LAMMPS_KimKoLee_2020_NaSn__MO_329881861557_000 Attempting to perform relaxation using initial lattice constant guess of 2.5 Angstroms Optimization terminated successfully. Current function value: -6.163702 Iterations: 31 Function evaluations: 62 {'lattice_constant': 3.7522854059934616, 'cohesive_energy': 3.0818507912361177, 'element': 'Sn', 'species': 'Sn" "Sn', 'crystal_structure': 'bcc', 'space_group': 'Im-3m', 'wyckoff_code': '2a', 'basis_atoms': '[[0.0 0.0 0.0] [0.5 0.5 0.5]]', 'iterations': 31, 'func_calls': 62, 'warnflag': 0, 'repeat': 0}