element: Ge lattice type: fcc modelname: SW_DingAndersen_1986_Ge__MO_775478537242_000 Attempting to perform relaxation using initial lattice constant guess of 2.5 Angstroms Optimization terminated successfully. Current function value: -10.976497 Iterations: 31 Function evaluations: 63 {'lattice_constant': 4.427709624171257, 'cohesive_energy': 2.7441243372124675, 'element': 'Ge', 'species': 'Ge" "Ge" "Ge" "Ge', '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': 63, 'warnflag': 0, 'repeat': 0}