Element = Lattice = Model = Element: O
Lattice: hcp
Model: Tersoff_LAMMPS_MunetohMotookaMoriguchi_2007_SiO__MO_501246546792_000
Computed model cutoff of 1.9999999941513362 Angstroms
Computed isolated atomic energy of 0.0 eV for species O

==============================================================================
==============================================================================
 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: -2.966261
         Iterations: 39
         Function evaluations: 81
Results for this minimization:
  a = 1.8974047576077298, total energy = -2.966260923235176

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: -2.966261
         Iterations: 38
         Function evaluations: 81
Results for this minimization:
  a = 1.8974047556519507, total energy = -2.9662609232351738

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: -2.966261
         Iterations: 37
         Function evaluations: 78
Results for this minimization:
  a = 1.8974047580268234, total energy = -2.9662609232351755

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: -2.966261
         Iterations: 35
         Function evaluations: 71
Results for this minimization:
  a = 1.8974047570489367, total energy = -2.966260923235176

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: -2.966261
         Iterations: 35
         Function evaluations: 73
Results for this minimization:
  a = 1.8974047590047123, total energy = -2.966260923235175

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: -2.966261
         Iterations: 34
         Function evaluations: 71
Results for this minimization:
  a = 1.8974047588650147, total energy = -2.966260923235176

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: -2.966261
         Iterations: 32
         Function evaluations: 66
Results for this minimization:
  a = 1.8974047579686166, total energy = -2.9662609232351778

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: -2.966261
         Iterations: 32
         Function evaluations: 66
Results for this minimization:
  a = 1.8974047587253153, total energy = -2.9662609232351764

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: -2.966261
         Iterations: 32
         Function evaluations: 66
Results for this minimization:
  a = 1.8974047573283312, total energy = -2.966260923235176

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 = [1.89740476] Angstroms and c = 2.4787591960278004 = ([1.30639453] * a) Angstroms

Optimization terminated successfully.
         Current function value: -4.439308
         Iterations: 81
         Function evaluations: 165
Results for this minimization:
  a = 2.628493502796914, c = 2.0373312054674364, total energy = -4.439307557399589

Attempting to perform relaxation using initial lattice constant guess of a = [1.89740476] Angstroms and c = 2.633681645779538 = ([1.38804419] * a) Angstroms

Optimization terminated successfully.
         Current function value: -4.439308
         Iterations: 74
         Function evaluations: 155
Results for this minimization:
  a = 2.6284935236037277, c = 2.0373311724675816, total energy = -4.439307557399587

Attempting to perform relaxation using initial lattice constant guess of a = [1.89740476] Angstroms and c = 2.7886040955312756 = ([1.46969385] * a) Angstroms

Optimization terminated successfully.
         Current function value: -4.439308
         Iterations: 72
         Function evaluations: 156
Results for this minimization:
  a = 2.628493509072838, c = 2.0373311852824836, total energy = -4.439307557399587

Attempting to perform relaxation using initial lattice constant guess of a = [1.89740476] Angstroms and c = 2.9435265452830133 = ([1.5513435] * a) Angstroms

Optimization terminated successfully.
         Current function value: -4.439308
         Iterations: 80
         Function evaluations: 167
Results for this minimization:
  a = 2.628493496374184, c = 2.0373312120799394, total energy = -4.439307557399587

Attempting to perform relaxation using initial lattice constant guess of a = [1.89740476] Angstroms and c = 3.098448995034751 = ([1.63299316] * a) Angstroms

Optimization terminated successfully.
         Current function value: -3.455238
         Iterations: 81
         Function evaluations: 198
Results for this minimization:
  a = 1.8473883642493711, c = 3.6100227830486267, total energy = -3.455238204706888

Attempting to perform relaxation using initial lattice constant guess of a = [1.89740476] Angstroms and c = 3.2533714447864885 = ([1.71464282] * a) Angstroms

Optimization terminated successfully.
         Current function value: -3.455238
         Iterations: 87
         Function evaluations: 193
Results for this minimization:
  a = 1.847388365260572, c = 3.4031940406182244, total energy = -3.4552382047068884

Attempting to perform relaxation using initial lattice constant guess of a = [1.89740476] Angstroms and c = 3.408293894538226 = ([1.79629248] * a) Angstroms

Optimization terminated successfully.
         Current function value: -3.455238
         Iterations: 92
         Function evaluations: 196
Results for this minimization:
  a = 1.8473883622705167, c = 3.5756195238083985, total energy = -3.455238204706887

Attempting to perform relaxation using initial lattice constant guess of a = [1.89740476] Angstroms and c = 3.563216344289964 = ([1.87794214] * a) Angstroms

Optimization terminated successfully.
         Current function value: -3.455238
         Iterations: 91
         Function evaluations: 208
Results for this minimization:
  a = 1.8473883637567832, c = 3.5751224995868798, total energy = -3.455238204706889

Attempting to perform relaxation using initial lattice constant guess of a = [1.89740476] Angstroms and c = 3.7181387940417014 = ([1.95959179] * a) Angstroms

Optimization terminated successfully.
         Current function value: -3.455238
         Iterations: 87
         Function evaluations: 212
Results for this minimization:
  a = 1.8473883651931673, c = 3.9934648405014657, total energy = -3.455238204706888