Element = Lattice = Model = Element: Ni
Lattice: hcp
Model: Morse_Shifted_GirifalcoWeizer_1959HighCutoff_Ni__MO_381861218831_004
Computed model cutoff of 9.754759994447236 Angstroms
Computed isolated atomic energy of 0.0 eV for species Ni

==============================================================================
==============================================================================
 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: -16.961743
         Iterations: 38
         Function evaluations: 81
Results for this minimization:
  a = 2.4910553933121298, total energy = -16.961743351820786

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: -16.961743
         Iterations: 38
         Function evaluations: 82
Results for this minimization:
  a = 2.491055347770452, total energy = -16.9617433518207

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: -16.961743
         Iterations: 39
         Function evaluations: 84
Results for this minimization:
  a = 2.4910553321242332, total energy = -16.961743351820704

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: -16.961743
         Iterations: 37
         Function evaluations: 81
Results for this minimization:
  a = 2.4910553718917128, total energy = -16.961743351820726

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: -16.961743
         Iterations: 37
         Function evaluations: 79
Results for this minimization:
  a = 2.4910553634166748, total energy = -16.96174335182072

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: -16.961743
         Iterations: 37
         Function evaluations: 78
Results for this minimization:
  a = 2.49105537608266, total energy = -16.96174335182073

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: -16.961743
         Iterations: 36
         Function evaluations: 78
Results for this minimization:
  a = 2.4910553690046076, total energy = -16.961743351820786

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: -16.961743
         Iterations: 36
         Function evaluations: 79
Results for this minimization:
  a = 2.4910553321242332, total energy = -16.9617433518207

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: -16.961743
         Iterations: 34
         Function evaluations: 72
Results for this minimization:
  a = 2.491055393312128, total energy = -16.961743351820775

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: -16.961743
         Iterations: 34
         Function evaluations: 74
Results for this minimization:
  a = 2.4910553518217067, total energy = -16.961743351820715

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: -16.961743
         Iterations: 33
         Function evaluations: 73
Results for this minimization:
  a = 2.4910553477704527, total energy = -16.961743351820708

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: -16.961743
         Iterations: 32
         Function evaluations: 71
Results for this minimization:
  a = 2.4910553505993445, total energy = -16.96174335182068

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: -16.961743
         Iterations: 32
         Function evaluations: 72
Results for this minimization:
  a = 2.4910553321242332, total energy = -16.961743351820697

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: -16.961743
         Iterations: 37
         Function evaluations: 81
Results for this minimization:
  a = 2.4910553183988657, total energy = -16.96174335182072

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: -16.961743
         Iterations: 34
         Function evaluations: 74
Results for this minimization:
  a = 2.4910553718917074, total energy = -16.96174335182073

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: -16.961743
         Iterations: 34
         Function evaluations: 73
Results for this minimization:
  a = 2.4910554000176477, total energy = -16.96174335182062

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: -16.961743
         Iterations: 35
         Function evaluations: 77
Results for this minimization:
  a = 2.491055363416671, total energy = -16.961743351820694

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: -16.961743
         Iterations: 36
         Function evaluations: 78
Results for this minimization:
  a = 2.4910553827066906, total energy = -16.9617433518207

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: -16.961743
         Iterations: 35
         Function evaluations: 73
Results for this minimization:
  a = 2.491055376082658, total energy = -16.961743351820743

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: -16.961743
         Iterations: 37
         Function evaluations: 78
Results for this minimization:
  a = 2.4910553427413094, total energy = -16.961743351820722

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: -16.961743
         Iterations: 37
         Function evaluations: 79
Results for this minimization:
  a = 2.4910553561290723, total energy = -16.961743351820665

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: -16.961743
         Iterations: 37
         Function evaluations: 81
Results for this minimization:
  a = 2.4910553718917057, total energy = -16.961743351820747

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: -16.961743
         Iterations: 37
         Function evaluations: 81
Results for this minimization:
  a = 2.4910553321242332, total energy = -16.961743351820708

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: -16.961743
         Iterations: 37
         Function evaluations: 78
Results for this minimization:
  a = 2.4910553609835873, total energy = -16.96174335182075

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: -16.961743
         Iterations: 37
         Function evaluations: 78
Results for this minimization:
  a = 2.4910553933121253, total energy = -16.961743351820786

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: -16.961743
         Iterations: 37
         Function evaluations: 78
Results for this minimization:
  a = 2.491055332962425, total energy = -16.96174335182066

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: -16.961743
         Iterations: 37
         Function evaluations: 79
Results for this minimization:
  a = 2.491055351821703, total energy = -16.96174335182074

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: -16.961743
         Iterations: 38
         Function evaluations: 84
Results for this minimization:
  a = 2.4910553466761485, total energy = -16.96174335182066

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: -16.961743
         Iterations: 39
         Function evaluations: 83
Results for this minimization:
  a = 2.4910553477704473, total energy = -16.961743351820697

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: -16.961743
         Iterations: 38
         Function evaluations: 81
Results for this minimization:
  a = 2.4910553824156514, total energy = -16.96174335182068

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: -16.961743
         Iterations: 38
         Function evaluations: 82
Results for this minimization:
  a = 2.491055355686696, total energy = -16.9617433518207

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: -16.961743
         Iterations: 39
         Function evaluations: 85
Results for this minimization:
  a = 2.4910553565976414, total energy = -16.961743351820726

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: -16.961743
         Iterations: 38
         Function evaluations: 83
Results for this minimization:
  a = 2.4910553321242332, total energy = -16.961743351820708

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: -16.961743
         Iterations: 38
         Function evaluations: 81
Results for this minimization:
  a = 2.491055375174614, total energy = -16.961743351820708

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: -16.961743
         Iterations: 42
         Function evaluations: 92
Results for this minimization:
  a = 2.491055318398864, total energy = -16.961743351820704

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: -16.961743
         Iterations: 38
         Function evaluations: 82
Results for this minimization:
  a = 2.4910553616762643, total energy = -16.961743351820704

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: -16.961743
         Iterations: 39
         Function evaluations: 83
Results for this minimization:
  a = 2.491055371891704, total energy = -16.961743351820758

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: -16.961743
         Iterations: 38
         Function evaluations: 79
Results for this minimization:
  a = 2.4910553542140406, total energy = -16.961743351820697

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: -16.961743
         Iterations: 40
         Function evaluations: 85
Results for this minimization:
  a = 2.4910553978756007, total energy = -16.961743351820605

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: -16.961743
         Iterations: 41
         Function evaluations: 87
Results for this minimization:
  a = 2.4910553252702785, total energy = -16.961743351820672

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: -16.961743
         Iterations: 40
         Function evaluations: 84
Results for this minimization:
  a = 2.491055372008115, total energy = -16.96174335182072

Attempting to perform relaxation using initial lattice constant guess of a = 6.125 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: -16.961743
         Iterations: 40
         Function evaluations: 86
Results for this minimization:
  a = 2.491055375890569, total energy = -16.961743351820743

Attempting to perform relaxation using initial lattice constant guess of a = 6.25 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: -16.961743
         Iterations: 39
         Function evaluations: 85
Results for this minimization:
  a = 2.491055359132588, total energy = -16.961743351820687

Attempting to perform relaxation using initial lattice constant guess of a = 6.375 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: -16.961743
         Iterations: 39
         Function evaluations: 83
Results for this minimization:
  a = 2.491055368742671, total energy = -16.96174335182069

Attempting to perform relaxation using initial lattice constant guess of a = 6.5 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: -16.961743
         Iterations: 39
         Function evaluations: 82
Results for this minimization:
  a = 2.4910553762339918, total energy = -16.961743351820747

Attempting to perform relaxation using initial lattice constant guess of a = 6.625 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: -16.961743
         Iterations: 40
         Function evaluations: 87
Results for this minimization:
  a = 2.491055334988042, total energy = -16.961743351820726

Attempting to perform relaxation using initial lattice constant guess of a = 6.75 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: -16.961743
         Iterations: 41
         Function evaluations: 88
Results for this minimization:
  a = 2.491055342741306, total energy = -16.961743351820743

Attempting to perform relaxation using initial lattice constant guess of a = 6.875 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: -16.961743
         Iterations: 41
         Function evaluations: 88
Results for this minimization:
  a = 2.4910553512745537, total energy = -16.961743351820733

Attempting to perform relaxation using initial lattice constant guess of a = 7.0 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: -16.961743
         Iterations: 40
         Function evaluations: 84
Results for this minimization:
  a = 2.491055369004605, total energy = -16.96174335182076

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 9.754759994447236 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 9.754759994447236 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 9.754759994447236 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 9.754759994447236 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 = 7.625 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 = 7.625 Angstroms
Exception message:
Attempted to evaluate energy at a = -0.7624999999999922 Angstroms and c = -1.2451572859147695 Angstroms; the model cutoff was estimated to be 9.754759994447236 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 = 7.75 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 = 7.75 Angstroms
Exception message:
Attempted to evaluate energy at a = -0.7750000000000234 Angstroms and c = -1.2655697004380135 Angstroms; the model cutoff was estimated to be 9.754759994447236 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 = 7.875 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 = 7.875 Angstroms
Exception message:
Attempted to evaluate energy at a = -0.7875000000000156 Angstroms and c = -1.285982114961194 Angstroms; the model cutoff was estimated to be 9.754759994447236 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 = 8.0 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 = 8.0 Angstroms
Exception message:
Attempted to evaluate energy at a = -0.8000000000000078 Angstroms and c = -1.3063945294843744 Angstroms; the model cutoff was estimated to be 9.754759994447236 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 = 8.125 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 = 8.125 Angstroms
Exception message:
Attempted to evaluate energy at a = -0.8125 Angstroms and c = -1.3268069440075547 Angstroms; the model cutoff was estimated to be 9.754759994447236 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 = 8.25 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 = 8.25 Angstroms
Exception message:
Attempted to evaluate energy at a = -0.8249999999999922 Angstroms and c = -1.3472193585307353 Angstroms; the model cutoff was estimated to be 9.754759994447236 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 = 8.375 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 = 8.375 Angstroms
Exception message:
Attempted to evaluate energy at a = -0.8375000000000234 Angstroms and c = -1.3676317730539793 Angstroms; the model cutoff was estimated to be 9.754759994447236 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 = 8.5 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 = 8.5 Angstroms
Exception message:
Attempted to evaluate energy at a = -0.8500000000000156 Angstroms and c = -1.3880441875771599 Angstroms; the model cutoff was estimated to be 9.754759994447236 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 = 8.625 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 = 8.625 Angstroms
Exception message:
Attempted to evaluate energy at a = -0.8625000000000078 Angstroms and c = -1.4084566021003402 Angstroms; the model cutoff was estimated to be 9.754759994447236 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 = 8.75 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 = 8.75 Angstroms
Exception message:
Attempted to evaluate energy at a = -0.875 Angstroms and c = -1.4288690166235205 Angstroms; the model cutoff was estimated to be 9.754759994447236 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 = 8.875 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 = 8.875 Angstroms
Exception message:
Attempted to evaluate energy at a = -0.8874999999999922 Angstroms and c = -1.449281431146701 Angstroms; the model cutoff was estimated to be 9.754759994447236 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 = 9.0 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 = 9.0 Angstroms
Exception message:
Attempted to evaluate energy at a = -0.9000000000000234 Angstroms and c = -1.469693845669945 Angstroms; the model cutoff was estimated to be 9.754759994447236 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 = 9.125 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 = 9.125 Angstroms
Exception message:
Attempted to evaluate energy at a = -0.9125000000000156 Angstroms and c = -1.4901062601931256 Angstroms; the model cutoff was estimated to be 9.754759994447236 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 = 9.25 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 = 9.25 Angstroms
Exception message:
Attempted to evaluate energy at a = -0.9250000000000078 Angstroms and c = -1.510518674716306 Angstroms; the model cutoff was estimated to be 9.754759994447236 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 = 9.375 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 = 9.375 Angstroms
Exception message:
Attempted to evaluate energy at a = -0.9375 Angstroms and c = -1.5309310892394863 Angstroms; the model cutoff was estimated to be 9.754759994447236 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 = 9.5 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 = 9.5 Angstroms
Exception message:
Attempted to evaluate energy at a = -0.9499999999999922 Angstroms and c = -1.5513435037626666 Angstroms; the model cutoff was estimated to be 9.754759994447236 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 = 9.625 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 = 9.625 Angstroms
Exception message:
Attempted to evaluate energy at a = -0.9625000000000234 Angstroms and c = -1.5717559182859109 Angstroms; the model cutoff was estimated to be 9.754759994447236 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 = 9.75 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 = 9.75 Angstroms
Exception message:
Attempted to evaluate energy at a = -0.9750000000000156 Angstroms and c = -1.5921683328090912 Angstroms; the model cutoff was estimated to be 9.754759994447236 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 = 9.875 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 = 9.875 Angstroms
Exception message:
Attempted to evaluate energy at a = -0.9875000000000078 Angstroms and c = -1.6125807473322717 Angstroms; the model cutoff was estimated to be 9.754759994447236 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 = [2.49105539] Angstroms and c = 3.2543011384654816 = ([1.30639453] * a) Angstroms

Optimization terminated successfully.
         Current function value: -16.961743
         Iterations: 73
         Function evaluations: 156
Results for this minimization:
  a = 2.4910229392178795, c = 4.06798211725182, total energy = -16.961743397133414

Attempting to perform relaxation using initial lattice constant guess of a = [2.49105539] Angstroms and c = 3.457694959619574 = ([1.38804419] * a) Angstroms

Optimization terminated successfully.
         Current function value: -16.961743
         Iterations: 68
         Function evaluations: 152
Results for this minimization:
  a = 2.4910229642274064, c = 4.067981979345969, total energy = -16.961743397133393

Attempting to perform relaxation using initial lattice constant guess of a = [2.49105539] Angstroms and c = 3.6610887807736665 = ([1.46969385] * a) Angstroms

Optimization terminated successfully.
         Current function value: -16.961743
         Iterations: 74
         Function evaluations: 149
Results for this minimization:
  a = 2.491022938863135, c = 4.067982108520882, total energy = -16.96174339713338

Attempting to perform relaxation using initial lattice constant guess of a = [2.49105539] Angstroms and c = 3.864482601927759 = ([1.5513435] * a) Angstroms

Optimization terminated successfully.
         Current function value: -16.961743
         Iterations: 68
         Function evaluations: 146
Results for this minimization:
  a = 2.4910229440601435, c = 4.067982024873751, total energy = -16.96174339713334

Attempting to perform relaxation using initial lattice constant guess of a = [2.49105539] Angstroms and c = 4.067876423081851 = ([1.63299316] * a) Angstroms

Optimization terminated successfully.
         Current function value: -16.961743
         Iterations: 65
         Function evaluations: 141
Results for this minimization:
  a = 2.491022954954402, c = 4.067982123593637, total energy = -16.96174339713338

Attempting to perform relaxation using initial lattice constant guess of a = [2.49105539] Angstroms and c = 4.271270244235944 = ([1.71464282] * a) Angstroms

Optimization terminated successfully.
         Current function value: -16.961743
         Iterations: 75
         Function evaluations: 156
Results for this minimization:
  a = 2.4910229211558668, c = 4.067982199057125, total energy = -16.96174339713342

Attempting to perform relaxation using initial lattice constant guess of a = [2.49105539] Angstroms and c = 4.474664065390036 = ([1.79629248] * a) Angstroms

Optimization terminated successfully.
         Current function value: -16.961743
         Iterations: 69
         Function evaluations: 146
Results for this minimization:
  a = 2.4910229507506108, c = 4.067982153537364, total energy = -16.961743397133414

Attempting to perform relaxation using initial lattice constant guess of a = [2.49105539] Angstroms and c = 4.678057886544129 = ([1.87794214] * a) Angstroms

Optimization terminated successfully.
         Current function value: -16.961743
         Iterations: 72
         Function evaluations: 157
Results for this minimization:
  a = 2.491022969913333, c = 4.06798217805269, total energy = -16.961743397133382

Attempting to perform relaxation using initial lattice constant guess of a = [2.49105539] Angstroms and c = 4.881451707698221 = ([1.95959179] * a) Angstroms

Optimization terminated successfully.
         Current function value: -16.961743
         Iterations: 71
         Function evaluations: 152
Results for this minimization:
  a = 2.4910229268155097, c = 4.067982199376342, total energy = -16.961743397133386

==============================================================================
==============================================================================
 Finished with optimization
==============================================================================
==============================================================================

 Final lattice Constants:
   a = 2.4910229211558668 Angstroms, c = 4.067982199057125 Angstroms, c/a = 1.633057

 Total energy: -16.96174339713342 eV

 Cohesive energy: -4.240435849283355 eV/atom

==============================================================================
==============================================================================