Element = Lattice = Model = Element: N
Lattice: hcp
Model: Sim_LAMMPS_Polymorphic_NordAlbeErhart_2003_GaN__SM_333071728528_000
Computed model cutoff of 2.3987994011119356 Angstroms
Computed isolated atomic energy of 0.0 eV for species N

==============================================================================
==============================================================================
 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: -4.735030
         Iterations: 37
         Function evaluations: 81
Results for this minimization:
  a = 2.1928665399551424, total energy = -4.735029582895925

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: -4.735030
         Iterations: 40
         Function evaluations: 82
Results for this minimization:
  a = 2.1928665369283395, total energy = -4.735029582892722

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: -4.735030
         Iterations: 37
         Function evaluations: 76
Results for this minimization:
  a = 2.192866536322981, total energy = -4.7350295828927225

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: -4.735030
         Iterations: 40
         Function evaluations: 84
Results for this minimization:
  a = 2.1928665385232353, total energy = -4.73502958289593

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: -4.735030
         Iterations: 37
         Function evaluations: 78
Results for this minimization:
  a = 2.192866538465025, total energy = -4.735029582892721

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: -4.735030
         Iterations: 35
         Function evaluations: 74
Results for this minimization:
  a = 2.1928665380924954, total energy = -4.73502958289272

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: -4.735030
         Iterations: 35
         Function evaluations: 72
Results for this minimization:
  a = 2.192866536183283, total energy = -4.73502958289593

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: -4.735030
         Iterations: 33
         Function evaluations: 69
Results for this minimization:
  a = 2.1928665353916585, total energy = -4.73502958289272

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: -4.735030
         Iterations: 33
         Function evaluations: 69
Results for this minimization:
  a = 2.192866537999363, total energy = -4.7350295828927225

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: -4.735030
         Iterations: 33
         Function evaluations: 69
Results for this minimization:
  a = 2.1928665353916594, total energy = -4.735029582892722

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: -4.735030
         Iterations: 33
         Function evaluations: 68
Results for this minimization:
  a = 2.192866538185626, total energy = -4.73502958289272

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: -4.735030
         Iterations: 34
         Function evaluations: 71
Results for this minimization:
  a = 2.1928665384824853, total energy = -4.7350295828927225

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: -4.735030
         Iterations: 34
         Function evaluations: 71
Results for this minimization:
  a = 2.192866537719965, total energy = -4.735029582892722

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: 0.000000
         Iterations: 32
         Function evaluations: 95
Results for this minimization:
  a = 2.625, total energy = 0.0

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: 0.000000
         Iterations: 32
         Function evaluations: 95
Results for this minimization:
  a = 2.75, total energy = 0.0

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: 0.000000
         Iterations: 32
         Function evaluations: 95
Results for this minimization:
  a = 2.875, total energy = 0.0

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: 0.000000
         Iterations: 32
         Function evaluations: 95
Results for this minimization:
  a = 3.0, total energy = 0.0

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: 0.000000
         Iterations: 32
         Function evaluations: 95
Results for this minimization:
  a = 3.125, total energy = 0.0

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: 0.000000
         Iterations: 32
         Function evaluations: 95
Results for this minimization:
  a = 3.25, total energy = 0.0

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: 0.000000
         Iterations: 32
         Function evaluations: 95
Results for this minimization:
  a = 3.375, total energy = 0.0

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: 0.000000
         Iterations: 32
         Function evaluations: 95
Results for this minimization:
  a = 3.5, total energy = 0.0

==============================================================================
==============================================================================
 Starting optimization with both a and c/a relaxed
==============================================================================
==============================================================================


Attempting to perform relaxation using initial lattice constant guess of a = [2.19286654] Angstroms and c = 2.864748849816063 = ([1.30639453] * a) Angstroms

Optimization terminated successfully.
         Current function value: -6.775958
         Iterations: 79
         Function evaluations: 158
Results for this minimization:
  a = 2.693836889865313, c = 2.3772792687820807, total energy = -6.775958410264043

Attempting to perform relaxation using initial lattice constant guess of a = [2.19286654] Angstroms and c = 3.0437956529295667 = ([1.38804419] * a) Angstroms

Optimization terminated successfully.
         Current function value: -6.775958
         Iterations: 74
         Function evaluations: 155
Results for this minimization:
  a = 2.6938368833136073, c = 2.3772792671829825, total energy = -6.775958410264043

Attempting to perform relaxation using initial lattice constant guess of a = [2.19286654] Angstroms and c = 3.2228424560430704 = ([1.46969385] * a) Angstroms

Optimization terminated successfully.
         Current function value: -6.775958
         Iterations: 76
         Function evaluations: 153
Results for this minimization:
  a = 2.6938368865479543, c = 2.377279268354499, total energy = -6.775958410264042

Attempting to perform relaxation using initial lattice constant guess of a = [2.19286654] Angstroms and c = 3.401889259156574 = ([1.5513435] * a) Angstroms

Optimization terminated successfully.
         Current function value: -6.775958
         Iterations: 78
         Function evaluations: 169
Results for this minimization:
  a = 2.693836871993672, c = 2.3772792726632925, total energy = -6.775958410264046

Attempting to perform relaxation using initial lattice constant guess of a = [2.19286654] Angstroms and c = 3.580936062270078 = ([1.63299316] * a) Angstroms

Optimization terminated successfully.
         Current function value: -5.622985
         Iterations: 92
         Function evaluations: 209
Results for this minimization:
  a = 1.9677210947223431, c = 4.463977756952435, total energy = -5.622985069723327

Attempting to perform relaxation using initial lattice constant guess of a = [2.19286654] Angstroms and c = 3.7599828653835816 = ([1.71464282] * a) Angstroms

Optimization terminated successfully.
         Current function value: -5.622985
         Iterations: 93
         Function evaluations: 204
Results for this minimization:
  a = 1.9677211005942052, c = 4.391602022900824, total energy = -5.622985069723326

Attempting to perform relaxation using initial lattice constant guess of a = [2.19286654] Angstroms and c = 3.9390296684970854 = ([1.79629248] * a) Angstroms

Optimization terminated successfully.
         Current function value: -5.622985
         Iterations: 89
         Function evaluations: 214
Results for this minimization:
  a = 1.9677210937381566, c = 4.732097634574439, total energy = -5.622985069723327

Attempting to perform relaxation using initial lattice constant guess of a = [2.19286654] Angstroms and c = 4.118076471610589 = ([1.87794214] * a) Angstroms

Optimization terminated successfully.
         Current function value: -5.623016
         Iterations: 86
         Function evaluations: 189
Results for this minimization:
  a = 1.9677184515712385, c = 4.226355419276016, total energy = -5.62301597853739

Attempting to perform relaxation using initial lattice constant guess of a = [2.19286654] Angstroms and c = 4.297123274724093 = ([1.95959179] * a) Angstroms

Optimization terminated successfully.
         Current function value: -5.622985
         Iterations: 88
         Function evaluations: 206
Results for this minimization:
  a = 1.9677210929204347, c = 4.719143623038386, total energy = -5.622985069723328