Element = Lattice = Model = Element: C
Lattice: hcp
Model: Tersoff_LAMMPS_AlbeNordlundAverback_2002_PtC__MO_500121566391_002
Computed model cutoff of 1.9999999941513362 Angstroms
Computed isolated atomic energy of 0.0 eV for species C

==============================================================================
==============================================================================
 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: -14.655596
         Iterations: 39
         Function evaluations: 82
Results for this minimization:
  a = 1.8634045213460941, total energy = -14.655596466272126

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: -14.655596
         Iterations: 39
         Function evaluations: 81
Results for this minimization:
  a = 1.8634045230690393, total energy = -14.65559646627213

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: -14.655596
         Iterations: 37
         Function evaluations: 78
Results for this minimization:
  a = 1.863404521951452, total energy = -14.655596466272137

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: -14.655596
         Iterations: 35
         Function evaluations: 72
Results for this minimization:
  a = 1.8634045213228112, total energy = -14.655596466272133

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: -14.655596
         Iterations: 34
         Function evaluations: 71
Results for this minimization:
  a = 1.8634045198559772, total energy = -14.655596466272122

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: -14.655596
         Iterations: 33
         Function evaluations: 71
Results for this minimization:
  a = 1.863404521532357, total energy = -14.65559646627214

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: -14.655596
         Iterations: 32
         Function evaluations: 68
Results for this minimization:
  a = 1.863404524698853, total energy = -14.655596466272126

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: -14.655596
         Iterations: 32
         Function evaluations: 67
Results for this minimization:
  a = 1.863404521602206, total energy = -14.655596466272128

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: -14.655596
         Iterations: 33
         Function evaluations: 68
Results for this minimization:
  a = 1.8634045209735635, total energy = -14.65559646627213

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: 0.000000
         Iterations: 31
         Function evaluations: 92
Results for this minimization:
  a = 2.125, total energy = 0.0

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: 0.000000
         Iterations: 32
         Function evaluations: 95
Results for this minimization:
  a = 2.25, total energy = 0.0

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: 0.000000
         Iterations: 32
         Function evaluations: 95
Results for this minimization:
  a = 2.375, total energy = 0.0

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: 0.000000
         Iterations: 32
         Function evaluations: 95
Results for this minimization:
  a = 2.5, total energy = 0.0

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 = [1.86340452] Angstroms and c = 2.434341473146296 = ([1.30639453] * a) Angstroms

Optimization terminated successfully.
         Current function value: -21.406754
         Iterations: 83
         Function evaluations: 167
Results for this minimization:
  a = 2.4689860412435696, c = 1.9986932630986378, total energy = -21.406754013196853

Attempting to perform relaxation using initial lattice constant guess of a = [1.86340452] Angstroms and c = 2.5864878152179394 = ([1.38804419] * a) Angstroms

Optimization terminated successfully.
         Current function value: -21.406754
         Iterations: 80
         Function evaluations: 166
Results for this minimization:
  a = 2.46898603989542, c = 1.9986932604821186, total energy = -21.406754013196853

Attempting to perform relaxation using initial lattice constant guess of a = [1.86340452] Angstroms and c = 2.738634157289583 = ([1.46969385] * a) Angstroms

Optimization terminated successfully.
         Current function value: -21.406754
         Iterations: 79
         Function evaluations: 162
Results for this minimization:
  a = 2.4689860381303275, c = 1.9986932635236951, total energy = -21.406754013196856

Attempting to perform relaxation using initial lattice constant guess of a = [1.86340452] Angstroms and c = 2.8907804993612265 = ([1.5513435] * a) Angstroms

Optimization terminated successfully.
         Current function value: -21.406754
         Iterations: 83
         Function evaluations: 168
Results for this minimization:
  a = 2.4689860379914776, c = 1.9986932638096033, total energy = -21.406754013196867

Attempting to perform relaxation using initial lattice constant guess of a = [1.86340452] Angstroms and c = 3.04292684143287 = ([1.63299316] * a) Angstroms

Optimization terminated successfully.
         Current function value: -18.097751
         Iterations: 84
         Function evaluations: 193
Results for this minimization:
  a = 1.7698062989259387, c = 3.543296098796584, total energy = -18.09775052491467

Attempting to perform relaxation using initial lattice constant guess of a = [1.86340452] Angstroms and c = 3.1950731835045136 = ([1.71464282] * a) Angstroms

Optimization terminated successfully.
         Current function value: -18.097751
         Iterations: 91
         Function evaluations: 208
Results for this minimization:
  a = 1.7698063004907523, c = 3.5554226987930244, total energy = -18.097750524914666

Attempting to perform relaxation using initial lattice constant guess of a = [1.86340452] Angstroms and c = 3.347219525576157 = ([1.79629248] * a) Angstroms

Optimization terminated successfully.
         Current function value: -18.097751
         Iterations: 85
         Function evaluations: 201
Results for this minimization:
  a = 1.7698063007276423, c = 3.626614176256017, total energy = -18.097750524914673

Attempting to perform relaxation using initial lattice constant guess of a = [1.86340452] Angstroms and c = 3.4993658676478008 = ([1.87794214] * a) Angstroms

Optimization terminated successfully.
         Current function value: -18.097751
         Iterations: 82
         Function evaluations: 202
Results for this minimization:
  a = 1.7698062965956347, c = 3.6747360395769944, total energy = -18.09775052491467

Attempting to perform relaxation using initial lattice constant guess of a = [1.86340452] Angstroms and c = 3.6515122097194443 = ([1.95959179] * a) Angstroms

Optimization terminated successfully.
         Current function value: -18.097751
         Iterations: 79
         Function evaluations: 184
Results for this minimization:
  a = 1.7698063009576837, c = 3.598031012365796, total energy = -18.097750524914662