Element = Lattice = Model = Element: Pb
Lattice: hcp
Model: LJ_ElliottAkerson_2015_Universal__MO_959249795837_003
Computed model cutoff of 10.40569999814037 Angstroms
Computed isolated atomic energy of 0.0 eV for species Pb

==============================================================================
==============================================================================
 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))

Failed to perform relaxation w.r.t. 'a' with c/a fixed at sqrt(8/3) and an initial guess of a = 1.0 Angstroms
Exception message:
Attempted to evaluate energy at a = 1.0 Angstroms and c = 1.632993161855452 Angstroms; the model cutoff was estimated to be 10.40569999814037 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 = 1.125 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: -28.611439
         Iterations: 39
         Function evaluations: 84
Results for this minimization:
  a = 2.8398986971937115, total energy = -28.611439361974806

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: -28.611439
         Iterations: 38
         Function evaluations: 79
Results for this minimization:
  a = 2.8398987017571926, total energy = -28.61143936197477

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: -28.611439
         Iterations: 40
         Function evaluations: 85
Results for this minimization:
  a = 2.8398986591026247, total energy = -28.611439361974764

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: -28.611439
         Iterations: 40
         Function evaluations: 84
Results for this minimization:
  a = 2.8398986952379377, total energy = -28.61143936197474

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: -28.611439
         Iterations: 37
         Function evaluations: 79
Results for this minimization:
  a = 2.839898677240128, total energy = -28.611439361974718

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: -28.611439
         Iterations: 36
         Function evaluations: 75
Results for this minimization:
  a = 2.839898679871112, total energy = -28.611439361974888

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: -28.611439
         Iterations: 37
         Function evaluations: 78
Results for this minimization:
  a = 2.8398986952379346, total energy = -28.61143936197483

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: -28.611439
         Iterations: 35
         Function evaluations: 73
Results for this minimization:
  a = 2.83989868052304, total energy = -28.611439361974767

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: -28.611439
         Iterations: 36
         Function evaluations: 79
Results for this minimization:
  a = 2.8398986797546977, total energy = -28.611439361974778

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: -28.611439
         Iterations: 35
         Function evaluations: 76
Results for this minimization:
  a = 2.8398986971937115, total energy = -28.6114393619748

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: -28.611439
         Iterations: 36
         Function evaluations: 76
Results for this minimization:
  a = 2.83989869672805, total energy = -28.611439361974814

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: -28.611439
         Iterations: 34
         Function evaluations: 71
Results for this minimization:
  a = 2.8398987017571926, total energy = -28.611439361974767

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: -28.611439
         Iterations: 33
         Function evaluations: 71
Results for this minimization:
  a = 2.839898670092226, total energy = -28.611439361974806

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: -28.611439
         Iterations: 33
         Function evaluations: 70
Results for this minimization:
  a = 2.839898671396077, total energy = -28.611439361974963

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: -28.611439
         Iterations: 32
         Function evaluations: 68
Results for this minimization:
  a = 2.839898657845333, total energy = -28.6114393619748

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: -28.611439
         Iterations: 34
         Function evaluations: 74
Results for this minimization:
  a = 2.839898695237934, total energy = -28.611439361974835

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: -28.611439
         Iterations: 34
         Function evaluations: 72
Results for this minimization:
  a = 2.839898676611483, total energy = -28.611439361974824

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: -28.611439
         Iterations: 35
         Function evaluations: 76
Results for this minimization:
  a = 2.8398986678570495, total energy = -28.611439361974885

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: -28.611439
         Iterations: 34
         Function evaluations: 74
Results for this minimization:
  a = 2.8398986930027594, total energy = -28.611439361974778

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: -28.611439
         Iterations: 35
         Function evaluations: 73
Results for this minimization:
  a = 2.839898679871111, total energy = -28.611439361974895

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: -28.611439
         Iterations: 36
         Function evaluations: 77
Results for this minimization:
  a = 2.83989868108183, total energy = -28.611439361974853

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: -28.611439
         Iterations: 35
         Function evaluations: 74
Results for this minimization:
  a = 2.8398986952379346, total energy = -28.611439361974835

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: -28.611439
         Iterations: 38
         Function evaluations: 79
Results for this minimization:
  a = 2.839898648019877, total energy = -28.61143936197474

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: -28.611439
         Iterations: 36
         Function evaluations: 77
Results for this minimization:
  a = 2.8398986805230364, total energy = -28.61143936197474

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: -28.611439
         Iterations: 37
         Function evaluations: 79
Results for this minimization:
  a = 2.839898693229771, total energy = -28.6114393619748

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: -28.611439
         Iterations: 39
         Function evaluations: 84
Results for this minimization:
  a = 2.839898686681406, total energy = -28.611439361974814

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: -28.611439
         Iterations: 38
         Function evaluations: 80
Results for this minimization:
  a = 2.839898673351854, total energy = -28.611439361974828

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: -28.611439
         Iterations: 38
         Function evaluations: 82
Results for this minimization:
  a = 2.839898697193707, total energy = -28.611439361974785

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: -28.611439
         Iterations: 38
         Function evaluations: 83
Results for this minimization:
  a = 2.839898673351853, total energy = -28.611439361974817

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: -28.611439
         Iterations: 38
         Function evaluations: 80
Results for this minimization:
  a = 2.839898696728053, total energy = -28.611439361974817

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: -28.611439
         Iterations: 40
         Function evaluations: 85
Results for this minimization:
  a = 2.8398987010004912, total energy = -28.611439361974742

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: -28.611439
         Iterations: 39
         Function evaluations: 81
Results for this minimization:
  a = 2.8398987017571926, total energy = -28.611439361974735

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: -28.611439
         Iterations: 38
         Function evaluations: 83
Results for this minimization:
  a = 2.8398986707790703, total energy = -28.61143936197477

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: -28.611439
         Iterations: 38
         Function evaluations: 81
Results for this minimization:
  a = 2.8398986700922233, total energy = -28.611439361974792

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: -28.611439
         Iterations: 38
         Function evaluations: 81
Results for this minimization:
  a = 2.839898670837285, total energy = -28.611439361974814

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: -28.611439
         Iterations: 38
         Function evaluations: 82
Results for this minimization:
  a = 2.8398986651212876, total energy = -28.61143936197477

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: -28.611439
         Iterations: 38
         Function evaluations: 82
Results for this minimization:
  a = 2.8398986776010133, total energy = -28.611439361974913

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: -28.611439
         Iterations: 38
         Function evaluations: 81
Results for this minimization:
  a = 2.839898657845328, total energy = -28.6114393619748

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: -28.611439
         Iterations: 39
         Function evaluations: 82
Results for this minimization:
  a = 2.8398986761429095, total energy = -28.611439361974824

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: -28.611439
         Iterations: 40
         Function evaluations: 87
Results for this minimization:
  a = 2.8398987002670695, total energy = -28.61143936197475

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: -28.611439
         Iterations: 39
         Function evaluations: 83
Results for this minimization:
  a = 2.8398986903834125, total energy = -28.611439361974856

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: -28.611439
         Iterations: 39
         Function evaluations: 82
Results for this minimization:
  a = 2.839898676611483, total energy = -28.61143936197479

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: -28.611439
         Iterations: 39
         Function evaluations: 84
Results for this minimization:
  a = 2.8398986800020776, total energy = -28.611439361974814

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: -28.611439
         Iterations: 39
         Function evaluations: 83
Results for this minimization:
  a = 2.839898667857045, total energy = -28.61143936197487

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: -28.611439
         Iterations: 39
         Function evaluations: 83
Results for this minimization:
  a = 2.839898677736338, total energy = -28.611439361974863

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: -28.611439
         Iterations: 40
         Function evaluations: 87
Results for this minimization:
  a = 2.839898667857047, total energy = -28.61143936197487

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: -28.611439
         Iterations: 39
         Function evaluations: 82
Results for this minimization:
  a = 2.8398986909887753, total energy = -28.611439361974803

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: -28.611439
         Iterations: 40
         Function evaluations: 84
Results for this minimization:
  a = 2.839898671396075, total energy = -28.611439361974917

Attempting to perform relaxation using initial lattice constant guess of a = 7.125 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: -28.611439
         Iterations: 39
         Function evaluations: 83
Results for this minimization:
  a = 2.8398987002670695, total energy = -28.61143936197474

Attempting to perform relaxation using initial lattice constant guess of a = 7.25 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: -28.611439
         Iterations: 41
         Function evaluations: 87
Results for this minimization:
  a = 2.839898681081822, total energy = -28.611439361974877

Attempting to perform relaxation using initial lattice constant guess of a = 7.375 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: -28.611439
         Iterations: 41
         Function evaluations: 88
Results for this minimization:
  a = 2.8398986716405448, total energy = -28.61143936197482

Attempting to perform relaxation using initial lattice constant guess of a = 7.5 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: -28.611439
         Iterations: 40
         Function evaluations: 83
Results for this minimization:
  a = 2.8398986952379346, total energy = -28.611439361974796

Attempting to perform relaxation using initial lattice constant guess of a = 7.625 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: -28.611439
         Iterations: 40
         Function evaluations: 86
Results for this minimization:
  a = 2.839898683642974, total energy = -28.61143936197482

Attempting to perform relaxation using initial lattice constant guess of a = 7.75 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: -28.611439
         Iterations: 41
         Function evaluations: 85
Results for this minimization:
  a = 2.839898648019868, total energy = -28.611439361974693

Attempting to perform relaxation using initial lattice constant guess of a = 7.875 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: -28.611439
         Iterations: 41
         Function evaluations: 89
Results for this minimization:
  a = 2.839898677181909, total energy = -28.611439361974895

Attempting to perform relaxation using initial lattice constant guess of a = 8.0 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: -28.611439
         Iterations: 42
         Function evaluations: 89
Results for this minimization:
  a = 2.8398987174034067, total energy = -28.611439361974643

Attempting to perform relaxation using initial lattice constant guess of a = 8.125 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: -28.611439
         Iterations: 40
         Function evaluations: 86
Results for this minimization:
  a = 2.8398987017571926, total energy = -28.611439361974746

Attempting to perform relaxation using initial lattice constant guess of a = 8.25 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: -28.611439
         Iterations: 40
         Function evaluations: 86
Results for this minimization:
  a = 2.8398986964952244, total energy = -28.611439361974714

Attempting to perform relaxation using initial lattice constant guess of a = 8.375 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: -28.611439
         Iterations: 41
         Function evaluations: 87
Results for this minimization:
  a = 2.8398986434563858, total energy = -28.611439361974778

Attempting to perform relaxation using initial lattice constant guess of a = 8.5 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: -28.611439
         Iterations: 41
         Function evaluations: 86
Results for this minimization:
  a = 2.8398986849991976, total energy = -28.61143936197475

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 10.40569999814037 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 10.40569999814037 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 10.40569999814037 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 10.40569999814037 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 10.40569999814037 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 10.40569999814037 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 10.40569999814037 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 10.40569999814037 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 10.40569999814037 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 10.40569999814037 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 10.40569999814037 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 = 10.0 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 = 10.0 Angstroms
Exception message:
Attempted to evaluate energy at a = -1.0 Angstroms and c = -1.632993161855452 Angstroms; the model cutoff was estimated to be 10.40569999814037 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 = 10.125 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 = 10.125 Angstroms
Exception message:
Attempted to evaluate energy at a = -1.0124999999999922 Angstroms and c = -1.6534055763786324 Angstroms; the model cutoff was estimated to be 10.40569999814037 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 = 10.25 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 = 10.25 Angstroms
Exception message:
Attempted to evaluate energy at a = -1.0250000000000234 Angstroms and c = -1.6738179909018767 Angstroms; the model cutoff was estimated to be 10.40569999814037 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 = 10.375 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 = 10.375 Angstroms
Exception message:
Attempted to evaluate energy at a = -1.0375000000000156 Angstroms and c = -1.694230405425057 Angstroms; the model cutoff was estimated to be 10.40569999814037 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 = 10.5 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 = 10.5 Angstroms
Exception message:
Attempted to evaluate energy at a = -1.0500000000000078 Angstroms and c = -1.7146428199482375 Angstroms; the model cutoff was estimated to be 10.40569999814037 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 = [2.83989867] Angstroms and c = 3.7100280886017423 = ([1.30639453] * a) Angstroms

Optimization terminated successfully.
         Current function value: -28.611439
         Iterations: 71
         Function evaluations: 150
Results for this minimization:
  a = 2.8398797792127572, c = 4.637596835798316, total energy = -28.611439411262726

Attempting to perform relaxation using initial lattice constant guess of a = [2.83989867] Angstroms and c = 3.9419048441393514 = ([1.38804419] * a) Angstroms

Optimization terminated successfully.
         Current function value: -28.611439
         Iterations: 74
         Function evaluations: 158
Results for this minimization:
  a = 2.8398797946689918, c = 4.637596757739354, total energy = -28.61143941126278

Attempting to perform relaxation using initial lattice constant guess of a = [2.83989867] Angstroms and c = 4.1737815996769605 = ([1.46969385] * a) Angstroms

Optimization terminated successfully.
         Current function value: -28.611439
         Iterations: 76
         Function evaluations: 162
Results for this minimization:
  a = 2.839879784973993, c = 4.637596747018009, total energy = -28.611439411262793

Attempting to perform relaxation using initial lattice constant guess of a = [2.83989867] Angstroms and c = 4.40565835521457 = ([1.5513435] * a) Angstroms

Optimization terminated successfully.
         Current function value: -28.611439
         Iterations: 69
         Function evaluations: 155
Results for this minimization:
  a = 2.83987975963224, c = 4.637596759236981, total energy = -28.611439411262673

Attempting to perform relaxation using initial lattice constant guess of a = [2.83989867] Angstroms and c = 4.637535110752179 = ([1.63299316] * a) Angstroms

Optimization terminated successfully.
         Current function value: -28.611439
         Iterations: 67
         Function evaluations: 144
Results for this minimization:
  a = 2.8398797726337266, c = 4.637596802883201, total energy = -28.611439411262744

Attempting to perform relaxation using initial lattice constant guess of a = [2.83989867] Angstroms and c = 4.869411866289788 = ([1.71464282] * a) Angstroms

Optimization terminated successfully.
         Current function value: -28.611439
         Iterations: 80
         Function evaluations: 162
Results for this minimization:
  a = 2.8398797983592807, c = 4.637596781765445, total energy = -28.611439411262726

Attempting to perform relaxation using initial lattice constant guess of a = [2.83989867] Angstroms and c = 5.101288621827397 = ([1.79629248] * a) Angstroms

Optimization terminated successfully.
         Current function value: -28.611439
         Iterations: 71
         Function evaluations: 147
Results for this minimization:
  a = 2.8398797791920525, c = 4.637596863616207, total energy = -28.611439411262726

Attempting to perform relaxation using initial lattice constant guess of a = [2.83989867] Angstroms and c = 5.333165377365006 = ([1.87794214] * a) Angstroms

Optimization terminated successfully.
         Current function value: -28.611439
         Iterations: 72
         Function evaluations: 158
Results for this minimization:
  a = 2.8398798063568584, c = 4.637596801787379, total energy = -28.611439411262715

Attempting to perform relaxation using initial lattice constant guess of a = [2.83989867] Angstroms and c = 5.565042132902615 = ([1.95959179] * a) Angstroms

Optimization terminated successfully.
         Current function value: -28.611439
         Iterations: 67
         Function evaluations: 145
Results for this minimization:
  a = 2.8398798050418836, c = 4.637596807486206, total energy = -28.611439411262754

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

 Final lattice Constants:
   a = 2.839879784973993 Angstroms, c = 4.637596747018009 Angstroms, c/a = 1.633026

 Total energy: -28.611439411262793 eV

 Cohesive energy: -7.152859852815698 eV/atom

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