Element = Lattice = Model = Element: S Lattice: hcp Model: LJ_ElliottAkerson_2015_Universal__MO_959249795837_003 Computed model cutoff of 7.4835499995946995 Angstroms Computed isolated atomic energy of 0.0 eV for species S ============================================================================== ============================================================================== Starting optimization to find optimum lattice constant 'a' with c/a fixed to sqrt(8/3) ============================================================================== ============================================================================== Attempting to perform relaxation using initial lattice constant guess of a = 1.0 Angstroms (c/a fixed at sqrt(8/3)) Optimization terminated successfully. Current function value: -145.532955 Iterations: 38 Function evaluations: 81 Results for this minimization: a = 2.042399179935458, total energy = -145.5329548678361 Attempting to perform relaxation using initial lattice constant guess of a = 1.125 Angstroms (c/a fixed at sqrt(8/3)) Optimization terminated successfully. Current function value: -145.532955 Iterations: 37 Function evaluations: 79 Results for this minimization: a = 2.042399156489409, total energy = -145.53295486783645 Attempting to perform relaxation using initial lattice constant guess of a = 1.25 Angstroms (c/a fixed at sqrt(8/3)) Optimization terminated successfully. Current function value: -145.532955 Iterations: 39 Function evaluations: 84 Results for this minimization: a = 2.042399181984365, total energy = -145.53295486783628 Attempting to perform relaxation using initial lattice constant guess of a = 1.375 Angstroms (c/a fixed at sqrt(8/3)) Optimization terminated successfully. Current function value: -145.532955 Iterations: 37 Function evaluations: 80 Results for this minimization: a = 2.0423991758376387, total energy = -145.5329548678362 Attempting to perform relaxation using initial lattice constant guess of a = 1.5 Angstroms (c/a fixed at sqrt(8/3)) Optimization terminated successfully. Current function value: -145.532955 Iterations: 35 Function evaluations: 76 Results for this minimization: a = 2.042399150133134, total energy = -145.5329548678361 Attempting to perform relaxation using initial lattice constant guess of a = 1.625 Angstroms (c/a fixed at sqrt(8/3)) Optimization terminated successfully. Current function value: -145.532955 Iterations: 35 Function evaluations: 74 Results for this minimization: a = 2.042399174632738, total energy = -145.53295486783645 Attempting to perform relaxation using initial lattice constant guess of a = 1.75 Angstroms (c/a fixed at sqrt(8/3)) Optimization terminated successfully. Current function value: -145.532955 Iterations: 33 Function evaluations: 71 Results for this minimization: a = 2.042399163136724, total energy = -145.5329548678366 Attempting to perform relaxation using initial lattice constant guess of a = 1.875 Angstroms (c/a fixed at sqrt(8/3)) Optimization terminated successfully. Current function value: -145.532955 Iterations: 34 Function evaluations: 71 Results for this minimization: a = 2.0423991454881616, total energy = -145.53295486783603 Attempting to perform relaxation using initial lattice constant guess of a = 2.0 Angstroms (c/a fixed at sqrt(8/3)) Optimization terminated successfully. Current function value: -145.532955 Iterations: 33 Function evaluations: 72 Results for this minimization: a = 2.0423991829156876, total energy = -145.53295486783605 Attempting to perform relaxation using initial lattice constant guess of a = 2.125 Angstroms (c/a fixed at sqrt(8/3)) Optimization terminated successfully. Current function value: -145.532955 Iterations: 32 Function evaluations: 69 Results for this minimization: a = 2.042399158526677, total energy = -145.5329548678366 Attempting to perform relaxation using initial lattice constant guess of a = 2.25 Angstroms (c/a fixed at sqrt(8/3)) Optimization terminated successfully. Current function value: -145.532955 Iterations: 34 Function evaluations: 73 Results for this minimization: a = 2.042399156489409, total energy = -145.53295486783648 Attempting to perform relaxation using initial lattice constant guess of a = 2.375 Angstroms (c/a fixed at sqrt(8/3)) Optimization terminated successfully. Current function value: -145.532955 Iterations: 34 Function evaluations: 74 Results for this minimization: a = 2.0423991575837137, total energy = -145.53295486783657 Attempting to perform relaxation using initial lattice constant guess of a = 2.5 Angstroms (c/a fixed at sqrt(8/3)) Optimization terminated successfully. Current function value: -145.532955 Iterations: 37 Function evaluations: 80 Results for this minimization: a = 2.042399181984365, total energy = -145.53295486783622 Attempting to perform relaxation using initial lattice constant guess of a = 2.625 Angstroms (c/a fixed at sqrt(8/3)) Optimization terminated successfully. Current function value: -145.532955 Iterations: 35 Function evaluations: 75 Results for this minimization: a = 2.0423991677002045, total energy = -145.53295486783696 Attempting to perform relaxation using initial lattice constant guess of a = 2.75 Angstroms (c/a fixed at sqrt(8/3)) Optimization terminated successfully. Current function value: -145.532955 Iterations: 35 Function evaluations: 75 Results for this minimization: a = 2.0423991656571157, total energy = -145.5329548678374 Attempting to perform relaxation using initial lattice constant guess of a = 2.875 Angstroms (c/a fixed at sqrt(8/3)) Optimization terminated successfully. Current function value: -145.532955 Iterations: 36 Function evaluations: 78 Results for this minimization: a = 2.042399161338107, total energy = -145.53295486783628 Attempting to perform relaxation using initial lattice constant guess of a = 3.0 Angstroms (c/a fixed at sqrt(8/3)) Optimization terminated successfully. Current function value: -145.532955 Iterations: 36 Function evaluations: 78 Results for this minimization: a = 2.0423991501331304, total energy = -145.53295486783614 Attempting to perform relaxation using initial lattice constant guess of a = 3.125 Angstroms (c/a fixed at sqrt(8/3)) Optimization terminated successfully. Current function value: -145.532955 Iterations: 36 Function evaluations: 74 Results for this minimization: a = 2.042399164638482, total energy = -145.5329548678367 Attempting to perform relaxation using initial lattice constant guess of a = 3.25 Angstroms (c/a fixed at sqrt(8/3)) Optimization terminated successfully. Current function value: -145.532955 Iterations: 37 Function evaluations: 78 Results for this minimization: a = 2.042399170470888, total energy = -145.53295486783605 Attempting to perform relaxation using initial lattice constant guess of a = 3.375 Angstroms (c/a fixed at sqrt(8/3)) Optimization terminated successfully. Current function value: -145.532955 Iterations: 38 Function evaluations: 82 Results for this minimization: a = 2.04239916759543, total energy = -145.532954867837 Attempting to perform relaxation using initial lattice constant guess of a = 3.5 Angstroms (c/a fixed at sqrt(8/3)) Optimization terminated successfully. Current function value: -145.532955 Iterations: 38 Function evaluations: 80 Results for this minimization: a = 2.042399158817714, total energy = -145.5329548678364 Attempting to perform relaxation using initial lattice constant guess of a = 3.625 Angstroms (c/a fixed at sqrt(8/3)) Optimization terminated successfully. Current function value: -145.532955 Iterations: 40 Function evaluations: 84 Results for this minimization: a = 2.0423991578805696, total energy = -145.53295486783637 Attempting to perform relaxation using initial lattice constant guess of a = 3.75 Angstroms (c/a fixed at sqrt(8/3)) Optimization terminated successfully. Current function value: -145.532955 Iterations: 39 Function evaluations: 81 Results for this minimization: a = 2.0423991454881616, total energy = -145.53295486783608 Attempting to perform relaxation using initial lattice constant guess of a = 3.875 Angstroms (c/a fixed at sqrt(8/3)) Optimization terminated successfully. Current function value: -145.532955 Iterations: 37 Function evaluations: 80 Results for this minimization: a = 2.0423991518036884, total energy = -145.53295486783597 Attempting to perform relaxation using initial lattice constant guess of a = 4.0 Angstroms (c/a fixed at sqrt(8/3)) Optimization terminated successfully. Current function value: -145.532955 Iterations: 39 Function evaluations: 83 Results for this minimization: a = 2.042399182915686, total energy = -145.53295486783608 Attempting to perform relaxation using initial lattice constant guess of a = 4.125 Angstroms (c/a fixed at sqrt(8/3)) Optimization terminated successfully. Current function value: -145.532955 Iterations: 37 Function evaluations: 78 Results for this minimization: a = 2.042399170075079, total energy = -145.5329548678371 Attempting to perform relaxation using initial lattice constant guess of a = 4.25 Angstroms (c/a fixed at sqrt(8/3)) Optimization terminated successfully. Current function value: -145.532955 Iterations: 38 Function evaluations: 80 Results for this minimization: a = 2.0423991581308614, total energy = -145.53295486783634 Attempting to perform relaxation using initial lattice constant guess of a = 4.375 Angstroms (c/a fixed at sqrt(8/3)) Optimization terminated successfully. Current function value: -145.532955 Iterations: 40 Function evaluations: 84 Results for this minimization: a = 2.042399158817716, total energy = -145.53295486783645 Attempting to perform relaxation using initial lattice constant guess of a = 4.5 Angstroms (c/a fixed at sqrt(8/3)) Optimization terminated successfully. Current function value: -145.532955 Iterations: 39 Function evaluations: 80 Results for this minimization: a = 2.042399159632618, total energy = -145.53295486783662 Attempting to perform relaxation using initial lattice constant guess of a = 4.625 Angstroms (c/a fixed at sqrt(8/3)) Optimization terminated successfully. Current function value: -145.532955 Iterations: 38 Function evaluations: 81 Results for this minimization: a = 2.0423991562798602, total energy = -145.53295486783628 Attempting to perform relaxation using initial lattice constant guess of a = 4.75 Angstroms (c/a fixed at sqrt(8/3)) Optimization terminated successfully. Current function value: -145.532955 Iterations: 40 Function evaluations: 85 Results for this minimization: a = 2.042399159463823, total energy = -145.53295486783668 Attempting to perform relaxation using initial lattice constant guess of a = 4.875 Angstroms (c/a fixed at sqrt(8/3)) Optimization terminated successfully. Current function value: -145.532955 Iterations: 39 Function evaluations: 83 Results for this minimization: a = 2.042399167595427, total energy = -145.53295486783682 Attempting to perform relaxation using initial lattice constant guess of a = 5.0 Angstroms (c/a fixed at sqrt(8/3)) Optimization terminated successfully. Current function value: -145.532955 Iterations: 41 Function evaluations: 88 Results for this minimization: a = 2.0423991839634255, total energy = -145.53295486783625 Attempting to perform relaxation using initial lattice constant guess of a = 5.125 Angstroms (c/a fixed at sqrt(8/3)) Optimization terminated successfully. Current function value: -145.532955 Iterations: 40 Function evaluations: 84 Results for this minimization: a = 2.0423991740681164, total energy = -145.53295486783617 Attempting to perform relaxation using initial lattice constant guess of a = 5.25 Angstroms (c/a fixed at sqrt(8/3)) Optimization terminated successfully. Current function value: -145.532955 Iterations: 39 Function evaluations: 83 Results for this minimization: a = 2.0423991677002027, total energy = -145.53295486783693 Attempting to perform relaxation using initial lattice constant guess of a = 5.375 Angstroms (c/a fixed at sqrt(8/3)) Optimization terminated successfully. Current function value: -145.532955 Iterations: 40 Function evaluations: 86 Results for this minimization: a = 2.0423991658841287, total energy = -145.5329548678363 Attempting to perform relaxation using initial lattice constant guess of a = 5.5 Angstroms (c/a fixed at sqrt(8/3)) Optimization terminated successfully. Current function value: -145.532955 Iterations: 40 Function evaluations: 85 Results for this minimization: a = 2.04239917385275, total energy = -145.53295486783682 Attempting to perform relaxation using initial lattice constant guess of a = 5.625 Angstroms (c/a fixed at sqrt(8/3)) Optimization terminated successfully. Current function value: -145.532955 Iterations: 41 Function evaluations: 85 Results for this minimization: a = 2.042399158650369, total energy = -145.53295486783674 Attempting to perform relaxation using initial lattice constant guess of a = 5.75 Angstroms (c/a fixed at sqrt(8/3)) Optimization terminated successfully. Current function value: -145.532955 Iterations: 40 Function evaluations: 86 Results for this minimization: a = 2.0423991614719794, total energy = -145.5329548678364 Attempting to perform relaxation using initial lattice constant guess of a = 5.875 Angstroms (c/a fixed at sqrt(8/3)) Optimization terminated successfully. Current function value: -145.532955 Iterations: 40 Function evaluations: 85 Results for this minimization: a = 2.042399158130863, total energy = -145.53295486783648 Attempting to perform relaxation using initial lattice constant guess of a = 6.0 Angstroms (c/a fixed at sqrt(8/3)) Optimization terminated successfully. Current function value: -145.532955 Iterations: 42 Function evaluations: 90 Results for this minimization: a = 2.0423991573974396, total energy = -145.5329548678362 Attempting to perform relaxation using initial lattice constant guess of a = 6.125 Angstroms (c/a fixed at sqrt(8/3)) Failed to perform relaxation w.r.t. 'a' with c/a fixed at sqrt(8/3) and an initial guess of a = 6.125 Angstroms Exception message: Attempted to evaluate energy at a = -0.6125000000000078 Angstroms and c = -1.000208311636477 Angstroms; the model cutoff was estimated to be 7.4835499995946995 Angstroms. This may mean that the model does not possess close-range repulsive forces to prevent system collapse. In order to prevent possible neighbor list overflow, both a and c must be greater than 0.1 times the model cutoff... Continuing... Attempting to perform relaxation using initial lattice constant guess of a = 6.25 Angstroms (c/a fixed at sqrt(8/3)) Failed to perform relaxation w.r.t. 'a' with c/a fixed at sqrt(8/3) and an initial guess of a = 6.25 Angstroms Exception message: Attempted to evaluate energy at a = -0.625 Angstroms and c = -1.0206207261596576 Angstroms; the model cutoff was estimated to be 7.4835499995946995 Angstroms. This may mean that the model does not possess close-range repulsive forces to prevent system collapse. In order to prevent possible neighbor list overflow, both a and c must be greater than 0.1 times the model cutoff... Continuing... Attempting to perform relaxation using initial lattice constant guess of a = 6.375 Angstroms (c/a fixed at sqrt(8/3)) Failed to perform relaxation w.r.t. 'a' with c/a fixed at sqrt(8/3) and an initial guess of a = 6.375 Angstroms Exception message: Attempted to evaluate energy at a = -0.6375000000000028 Angstroms and c = -1.0410331406828552 Angstroms; the model cutoff was estimated to be 7.4835499995946995 Angstroms. This may mean that the model does not possess close-range repulsive forces to prevent system collapse. In order to prevent possible neighbor list overflow, both a and c must be greater than 0.1 times the model cutoff... Continuing... Attempting to perform relaxation using initial lattice constant guess of a = 6.5 Angstroms (c/a fixed at sqrt(8/3)) Failed to perform relaxation w.r.t. 'a' with c/a fixed at sqrt(8/3) and an initial guess of a = 6.5 Angstroms Exception message: Attempted to evaluate energy at a = -0.6500000000000128 Angstroms and c = -1.0614455552060647 Angstroms; the model cutoff was estimated to be 7.4835499995946995 Angstroms. This may mean that the model does not possess close-range repulsive forces to prevent system collapse. In order to prevent possible neighbor list overflow, both a and c must be greater than 0.1 times the model cutoff... Continuing... Attempting to perform relaxation using initial lattice constant guess of a = 6.625 Angstroms (c/a fixed at sqrt(8/3)) Failed to perform relaxation w.r.t. 'a' with c/a fixed at sqrt(8/3) and an initial guess of a = 6.625 Angstroms Exception message: Attempted to evaluate energy at a = -0.6625000000000156 Angstroms and c = -1.0818579697292625 Angstroms; the model cutoff was estimated to be 7.4835499995946995 Angstroms. This may mean that the model does not possess close-range repulsive forces to prevent system collapse. In order to prevent possible neighbor list overflow, both a and c must be greater than 0.1 times the model cutoff... Continuing... Attempting to perform relaxation using initial lattice constant guess of a = 6.75 Angstroms (c/a fixed at sqrt(8/3)) Failed to perform relaxation w.r.t. 'a' with c/a fixed at sqrt(8/3) and an initial guess of a = 6.75 Angstroms Exception message: Attempted to evaluate energy at a = -0.6750000000000078 Angstroms and c = -1.1022703842524428 Angstroms; the model cutoff was estimated to be 7.4835499995946995 Angstroms. This may mean that the model does not possess close-range repulsive forces to prevent system collapse. In order to prevent possible neighbor list overflow, both a and c must be greater than 0.1 times the model cutoff... Continuing... Attempting to perform relaxation using initial lattice constant guess of a = 6.875 Angstroms (c/a fixed at sqrt(8/3)) Failed to perform relaxation w.r.t. 'a' with c/a fixed at sqrt(8/3) and an initial guess of a = 6.875 Angstroms Exception message: Attempted to evaluate energy at a = -0.6875 Angstroms and c = -1.1226827987756234 Angstroms; the model cutoff was estimated to be 7.4835499995946995 Angstroms. This may mean that the model does not possess close-range repulsive forces to prevent system collapse. In order to prevent possible neighbor list overflow, both a and c must be greater than 0.1 times the model cutoff... Continuing... Attempting to perform relaxation using initial lattice constant guess of a = 7.0 Angstroms (c/a fixed at sqrt(8/3)) Failed to perform relaxation w.r.t. 'a' with c/a fixed at sqrt(8/3) and an initial guess of a = 7.0 Angstroms Exception message: Attempted to evaluate energy at a = -0.7000000000000028 Angstroms and c = -1.143095213298821 Angstroms; the model cutoff was estimated to be 7.4835499995946995 Angstroms. This may mean that the model does not possess close-range repulsive forces to prevent system collapse. In order to prevent possible neighbor list overflow, both a and c must be greater than 0.1 times the model cutoff... Continuing... Attempting to perform relaxation using initial lattice constant guess of a = 7.125 Angstroms (c/a fixed at sqrt(8/3)) Failed to perform relaxation w.r.t. 'a' with c/a fixed at sqrt(8/3) and an initial guess of a = 7.125 Angstroms Exception message: Attempted to evaluate energy at a = -0.7125000000000128 Angstroms and c = -1.1635076278220304 Angstroms; the model cutoff was estimated to be 7.4835499995946995 Angstroms. This may mean that the model does not possess close-range repulsive forces to prevent system collapse. In order to prevent possible neighbor list overflow, both a and c must be greater than 0.1 times the model cutoff... Continuing... Attempting to perform relaxation using initial lattice constant guess of a = 7.25 Angstroms (c/a fixed at sqrt(8/3)) Failed to perform relaxation w.r.t. 'a' with c/a fixed at sqrt(8/3) and an initial guess of a = 7.25 Angstroms Exception message: Attempted to evaluate energy at a = -0.7250000000000156 Angstroms and c = -1.1839200423452283 Angstroms; the model cutoff was estimated to be 7.4835499995946995 Angstroms. This may mean that the model does not possess close-range repulsive forces to prevent system collapse. In order to prevent possible neighbor list overflow, both a and c must be greater than 0.1 times the model cutoff... Continuing... Attempting to perform relaxation using initial lattice constant guess of a = 7.375 Angstroms (c/a fixed at sqrt(8/3)) Failed to perform relaxation w.r.t. 'a' with c/a fixed at sqrt(8/3) and an initial guess of a = 7.375 Angstroms Exception message: Attempted to evaluate energy at a = -0.7375000000000078 Angstroms and c = -1.2043324568684086 Angstroms; the model cutoff was estimated to be 7.4835499995946995 Angstroms. This may mean that the model does not possess close-range repulsive forces to prevent system collapse. In order to prevent possible neighbor list overflow, both a and c must be greater than 0.1 times the model cutoff... Continuing... Attempting to perform relaxation using initial lattice constant guess of a = 7.5 Angstroms (c/a fixed at sqrt(8/3)) Failed to perform relaxation w.r.t. 'a' with c/a fixed at sqrt(8/3) and an initial guess of a = 7.5 Angstroms Exception message: Attempted to evaluate energy at a = -0.75 Angstroms and c = -1.224744871391589 Angstroms; the model cutoff was estimated to be 7.4835499995946995 Angstroms. This may mean that the model does not possess close-range repulsive forces to prevent system collapse. In order to prevent possible neighbor list overflow, both a and c must be greater than 0.1 times the model cutoff... Continuing... ============================================================================== ============================================================================== Starting optimization with both a and c/a relaxed ============================================================================== ============================================================================== Attempting to perform relaxation using initial lattice constant guess of a = [2.04239917] Angstroms and c = 2.6681790970378807 = ([1.30639453] * a) Angstroms Optimization terminated successfully. Current function value: -145.532955 Iterations: 71 Function evaluations: 152 Results for this minimization: a = 2.042385583734804, c = 3.3352682271003724, total energy = -145.5329551185413 Attempting to perform relaxation using initial lattice constant guess of a = [2.04239917] Angstroms and c = 2.834940290602748 = ([1.38804419] * a) Angstroms Optimization terminated successfully. Current function value: -145.532955 Iterations: 69 Function evaluations: 154 Results for this minimization: a = 2.042385597964666, c = 3.3352682243080443, total energy = -145.53295511854122 Attempting to perform relaxation using initial lattice constant guess of a = [2.04239917] Angstroms and c = 3.0017014841676155 = ([1.46969385] * a) Angstroms Optimization terminated successfully. Current function value: -145.532955 Iterations: 73 Function evaluations: 153 Results for this minimization: a = 2.0423855922345364, c = 3.335268219744713, total energy = -145.53295511854125 Attempting to perform relaxation using initial lattice constant guess of a = [2.04239917] Angstroms and c = 3.168462677732483 = ([1.5513435] * a) Angstroms Optimization terminated successfully. Current function value: -145.532955 Iterations: 72 Function evaluations: 154 Results for this minimization: a = 2.042385590980478, c = 3.33526818871995, total energy = -145.53295511854117 Attempting to perform relaxation using initial lattice constant guess of a = [2.04239917] Angstroms and c = 3.3352238712973503 = ([1.63299316] * a) Angstroms Optimization terminated successfully. Current function value: -145.532955 Iterations: 67 Function evaluations: 140 Results for this minimization: a = 2.0423855637574526, c = 3.335268214550293, total energy = -145.53295511854105 Attempting to perform relaxation using initial lattice constant guess of a = [2.04239917] Angstroms and c = 3.5019850648622177 = ([1.71464282] * a) Angstroms Optimization terminated successfully. Current function value: -145.532955 Iterations: 75 Function evaluations: 156 Results for this minimization: a = 2.0423855770066486, c = 3.3352682132350324, total energy = -145.53295511854122 Attempting to perform relaxation using initial lattice constant guess of a = [2.04239917] Angstroms and c = 3.668746258427085 = ([1.79629248] * a) Angstroms Optimization terminated successfully. Current function value: -145.532955 Iterations: 74 Function evaluations: 158 Results for this minimization: a = 2.042385572143802, c = 3.3352682222268806, total energy = -145.53295511854122 Attempting to perform relaxation using initial lattice constant guess of a = [2.04239917] Angstroms and c = 3.8355074519919525 = ([1.87794214] * a) Angstroms Optimization terminated successfully. Current function value: -145.532955 Iterations: 73 Function evaluations: 155 Results for this minimization: a = 2.0423855959463078, c = 3.335268193559099, total energy = -145.53295511854148 Attempting to perform relaxation using initial lattice constant guess of a = [2.04239917] Angstroms and c = 4.0022686455568195 = ([1.95959179] * a) Angstroms Optimization terminated successfully. Current function value: -145.532955 Iterations: 68 Function evaluations: 145 Results for this minimization: a = 2.042385606581637, c = 3.3352681777243776, total energy = -145.532955118541 ============================================================================== ============================================================================== Finished with optimization ============================================================================== ============================================================================== Final lattice Constants: a = 2.0423855959463078 Angstroms, c = 3.335268193559099 Angstroms, c/a = 1.633026 Total energy: -145.53295511854148 eV Cohesive energy: -36.38323877963537 eV/atom ============================================================================== ==============================================================================