Element = Lattice = Model = Element: Pb
Lattice: hcp
Model: EAM_Dynamo_WangZhuXiang_2018pot2_Pb__MO_961101070310_001
Computed model cutoff of 9.422545227408422 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))

Optimization terminated successfully.
         Current function value: -8.151406
         Iterations: 39
         Function evaluations: 85
Results for this minimization:
  a = 3.5253485679626517, total energy = -8.15140601330831

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: -8.151406
         Iterations: 41
         Function evaluations: 88
Results for this minimization:
  a = 3.5253485043067476, total energy = -8.15140601330834

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: -8.151406
         Iterations: 39
         Function evaluations: 83
Results for this minimization:
  a = 3.5253485031425953, total energy = -8.15140601330838

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: -8.151406
         Iterations: 40
         Function evaluations: 87
Results for this minimization:
  a = 3.5253484934568498, total energy = -8.15140601330838

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: -8.151406
         Iterations: 39
         Function evaluations: 83
Results for this minimization:
  a = 3.5253485083580065, total energy = -8.151406013308348

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: -8.151406
         Iterations: 38
         Function evaluations: 80
Results for this minimization:
  a = 3.5253484964370756, total energy = -8.151406013308364

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: -8.151406
         Iterations: 39
         Function evaluations: 84
Results for this minimization:
  a = 3.525348513154312, total energy = -8.151406013308348

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: -8.151406
         Iterations: 37
         Function evaluations: 80
Results for this minimization:
  a = 3.525348500115797, total energy = -8.151406013308371

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: -8.151406
         Iterations: 37
         Function evaluations: 80
Results for this minimization:
  a = 3.52534856796265, total energy = -8.151406013308303

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: -8.151406
         Iterations: 38
         Function evaluations: 80
Results for this minimization:
  a = 3.5253485227120125, total energy = -8.151406013308392

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: -8.151406
         Iterations: 37
         Function evaluations: 78
Results for this minimization:
  a = 3.5253485192370144, total energy = -8.151406013308371

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: -8.151406
         Iterations: 37
         Function evaluations: 80
Results for this minimization:
  a = 3.5253484964370703, total energy = -8.151406013308362

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: -8.151406
         Iterations: 36
         Function evaluations: 77
Results for this minimization:
  a = 3.5253485031425953, total energy = -8.15140601330837

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: -8.151406
         Iterations: 37
         Function evaluations: 79
Results for this minimization:
  a = 3.5253485143563026, total energy = -8.151406013308375

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: -8.151406
         Iterations: 35
         Function evaluations: 77
Results for this minimization:
  a = 3.5253484934568426, total energy = -8.151406013308367

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: -8.151406
         Iterations: 35
         Function evaluations: 76
Results for this minimization:
  a = 3.525348530896009, total energy = -8.151406013308351

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: -8.151406
         Iterations: 34
         Function evaluations: 72
Results for this minimization:
  a = 3.5253484994173063, total energy = -8.151406013308353

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: -8.151406
         Iterations: 33
         Function evaluations: 72
Results for this minimization:
  a = 3.5253485338762403, total energy = -8.151406013308385

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: -8.151406
         Iterations: 33
         Function evaluations: 70
Results for this minimization:
  a = 3.525348496437074, total energy = -8.151406013308367

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: -8.151406
         Iterations: 32
         Function evaluations: 69
Results for this minimization:
  a = 3.525348491105251, total energy = -8.15140601330835

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: -8.151406
         Iterations: 32
         Function evaluations: 69
Results for this minimization:
  a = 3.525348501093685, total energy = -8.151406013308371

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: -8.151406
         Iterations: 33
         Function evaluations: 71
Results for this minimization:
  a = 3.525348548591137, total energy = -8.151406013308344

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: -8.151406
         Iterations: 33
         Function evaluations: 72
Results for this minimization:
  a = 3.525348500115797, total energy = -8.151406013308373

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: -8.151406
         Iterations: 34
         Function evaluations: 72
Results for this minimization:
  a = 3.5253484833985556, total energy = -8.151406013308318

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: -8.151406
         Iterations: 34
         Function evaluations: 76
Results for this minimization:
  a = 3.5253485552966604, total energy = -8.151406013308323

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: -8.151406
         Iterations: 35
         Function evaluations: 75
Results for this minimization:
  a = 3.5253485208610096, total energy = -8.151406013308348

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: -8.151406
         Iterations: 35
         Function evaluations: 74
Results for this minimization:
  a = 3.5253485223161976, total energy = -8.151406013308366

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: -8.151406
         Iterations: 36
         Function evaluations: 78
Results for this minimization:
  a = 3.52534843981266, total energy = -8.15140601330825

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: -8.151406
         Iterations: 37
         Function evaluations: 80
Results for this minimization:
  a = 3.5253485307097403, total energy = -8.151406013308353

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: -8.151406
         Iterations: 37
         Function evaluations: 79
Results for this minimization:
  a = 3.5253485201101276, total energy = -8.151406013308396

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: -8.151406
         Iterations: 37
         Function evaluations: 78
Results for this minimization:
  a = 3.525348496437074, total energy = -8.151406013308371

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: -8.151406
         Iterations: 38
         Function evaluations: 81
Results for this minimization:
  a = 3.5253485171328043, total energy = -8.151406013308344

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: -8.151406
         Iterations: 37
         Function evaluations: 79
Results for this minimization:
  a = 3.5253485031425953, total energy = -8.151406013308362

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: -8.151406
         Iterations: 38
         Function evaluations: 81
Results for this minimization:
  a = 3.5253484892309617, total energy = -8.151406013308339

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: -8.151406
         Iterations: 40
         Function evaluations: 87
Results for this minimization:
  a = 3.525348511728225, total energy = -8.151406013308364

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: -8.151406
         Iterations: 37
         Function evaluations: 79
Results for this minimization:
  a = 3.5253484888162365, total energy = -8.151406013308343

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: -8.151406
         Iterations: 38
         Function evaluations: 82
Results for this minimization:
  a = 3.525348492048212, total energy = -8.151406013308335

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: -8.151406
         Iterations: 39
         Function evaluations: 83
Results for this minimization:
  a = 3.5253485126886517, total energy = -8.151406013308364

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: -8.151406
         Iterations: 40
         Function evaluations: 87
Results for this minimization:
  a = 3.525348548567851, total energy = -8.151406013308335

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: -8.151406
         Iterations: 38
         Function evaluations: 83
Results for this minimization:
  a = 3.525348496437071, total energy = -8.151406013308366

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: -8.151406
         Iterations: 39
         Function evaluations: 83
Results for this minimization:
  a = 3.5253484994172997, total energy = -8.15140601330834

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: -8.151406
         Iterations: 38
         Function evaluations: 81
Results for this minimization:
  a = 3.5253485468914705, total energy = -8.151406013308343

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: -8.151406
         Iterations: 38
         Function evaluations: 82
Results for this minimization:
  a = 3.5253485338762403, total energy = -8.151406013308383

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: -8.151406
         Iterations: 40
         Function evaluations: 86
Results for this minimization:
  a = 3.5253485126188018, total energy = -8.151406013308376

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: -8.151406
         Iterations: 38
         Function evaluations: 81
Results for this minimization:
  a = 3.5253484964370685, total energy = -8.151406013308348

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: -8.151406
         Iterations: 40
         Function evaluations: 87
Results for this minimization:
  a = 3.525348539897816, total energy = -8.151406013308346

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: -8.151406
         Iterations: 39
         Function evaluations: 84
Results for this minimization:
  a = 3.5253485301596768, total energy = -8.151406013308375

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: -8.151406
         Iterations: 39
         Function evaluations: 82
Results for this minimization:
  a = 3.5253485327702947, total energy = -8.151406013308348

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: -8.151406
         Iterations: 39
         Function evaluations: 84
Results for this minimization:
  a = 3.525348512828348, total energy = -8.151406013308351

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: -8.151406
         Iterations: 38
         Function evaluations: 82
Results for this minimization:
  a = 3.525348526518786, total energy = -8.151406013308362

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: -8.151406
         Iterations: 39
         Function evaluations: 85
Results for this minimization:
  a = 3.525348547915921, total energy = -8.151406013308344

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: -8.151406
         Iterations: 38
         Function evaluations: 81
Results for this minimization:
  a = 3.525348489731546, total energy = -8.151406013308355

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: -8.151406
         Iterations: 39
         Function evaluations: 83
Results for this minimization:
  a = 3.525348499417305, total energy = -8.151406013308367

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: -8.151406
         Iterations: 41
         Function evaluations: 86
Results for this minimization:
  a = 3.5253484984394206, total energy = -8.151406013308357

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: -8.151406
         Iterations: 40
         Function evaluations: 85
Results for this minimization:
  a = 3.5253484992775945, total energy = -8.15140601330833

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: -8.151406
         Iterations: 39
         Function evaluations: 84
Results for this minimization:
  a = 3.525348526518785, total energy = -8.151406013308359

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: 0.000000
         Iterations: 36
         Function evaluations: 104
Results for this minimization:
  a = 10.000000000000005, total energy = 0.0

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: 0.000000
         Iterations: 36
         Function evaluations: 104
Results for this minimization:
  a = 10.15625, total energy = 0.0

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: 0.000000
         Iterations: 35
         Function evaluations: 102
Results for this minimization:
  a = 9.487499999999997, total energy = 0.0

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: 0.000000
         Iterations: 35
         Function evaluations: 102
Results for this minimization:
  a = 9.631250000000001, total energy = 0.0

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: 0.000000
         Iterations: 35
         Function evaluations: 102
Results for this minimization:
  a = 9.775000000000002, total energy = 0.0

Attempting to perform relaxation using initial lattice constant guess of a = 8.625 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: 0.000000
         Iterations: 35
         Function evaluations: 102
Results for this minimization:
  a = 9.4875, total energy = 0.0

Attempting to perform relaxation using initial lattice constant guess of a = 8.75 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: 0.000000
         Iterations: 35
         Function evaluations: 102
Results for this minimization:
  a = 9.625, total energy = 0.0

Attempting to perform relaxation using initial lattice constant guess of a = 8.875 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: 0.000000
         Iterations: 35
         Function evaluations: 102
Results for this minimization:
  a = 9.7625, total energy = 0.0

Attempting to perform relaxation using initial lattice constant guess of a = 9.0 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: 0.000000
         Iterations: 34
         Function evaluations: 100
Results for this minimization:
  a = 9.450000000000001, total energy = 0.0

Attempting to perform relaxation using initial lattice constant guess of a = 9.125 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: 0.000000
         Iterations: 34
         Function evaluations: 100
Results for this minimization:
  a = 9.58125, total energy = 0.0

Attempting to perform relaxation using initial lattice constant guess of a = 9.25 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: 0.000000
         Iterations: 34
         Function evaluations: 100
Results for this minimization:
  a = 9.7125, total energy = 0.0

Attempting to perform relaxation using initial lattice constant guess of a = 9.375 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: 0.000000
         Iterations: 34
         Function evaluations: 100
Results for this minimization:
  a = 9.84375, total energy = 0.0

Attempting to perform relaxation using initial lattice constant guess of a = 9.5 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: 0.000000
         Iterations: 34
         Function evaluations: 101
Results for this minimization:
  a = 9.5, total energy = 0.0

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


Attempting to perform relaxation using initial lattice constant guess of a = [3.52534852] Angstroms and c = 4.605496021197661 = ([1.30639453] * a) Angstroms

     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:
setting an array element with a sequence. The requested array has an inhomogeneous shape after 1 dimensions. The detected shape was (2,) + inhomogeneous part.
     Continuing...


Attempting to perform relaxation using initial lattice constant guess of a = [3.52534852] Angstroms and c = 4.893339522522515 = ([1.38804419] * a) Angstroms

     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:
setting an array element with a sequence. The requested array has an inhomogeneous shape after 1 dimensions. The detected shape was (2,) + inhomogeneous part.
     Continuing...


Attempting to perform relaxation using initial lattice constant guess of a = [3.52534852] Angstroms and c = 5.181183023847369 = ([1.46969385] * a) Angstroms

     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:
setting an array element with a sequence. The requested array has an inhomogeneous shape after 1 dimensions. The detected shape was (2,) + inhomogeneous part.
     Continuing...


Attempting to perform relaxation using initial lattice constant guess of a = [3.52534852] Angstroms and c = 5.469026525172223 = ([1.5513435] * a) Angstroms

     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:
setting an array element with a sequence. The requested array has an inhomogeneous shape after 1 dimensions. The detected shape was (2,) + inhomogeneous part.
     Continuing...


Attempting to perform relaxation using initial lattice constant guess of a = [3.52534852] Angstroms and c = 5.756870026497078 = ([1.63299316] * a) Angstroms

     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:
setting an array element with a sequence. The requested array has an inhomogeneous shape after 1 dimensions. The detected shape was (2,) + inhomogeneous part.
     Continuing...


Attempting to perform relaxation using initial lattice constant guess of a = [3.52534852] Angstroms and c = 6.044713527821932 = ([1.71464282] * a) Angstroms

     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:
setting an array element with a sequence. The requested array has an inhomogeneous shape after 1 dimensions. The detected shape was (2,) + inhomogeneous part.
     Continuing...


Attempting to perform relaxation using initial lattice constant guess of a = [3.52534852] Angstroms and c = 6.332557029146786 = ([1.79629248] * a) Angstroms

     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:
setting an array element with a sequence. The requested array has an inhomogeneous shape after 1 dimensions. The detected shape was (2,) + inhomogeneous part.
     Continuing...


Attempting to perform relaxation using initial lattice constant guess of a = [3.52534852] Angstroms and c = 6.62040053047164 = ([1.87794214] * a) Angstroms

     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:
setting an array element with a sequence. The requested array has an inhomogeneous shape after 1 dimensions. The detected shape was (2,) + inhomogeneous part.
     Continuing...


Attempting to perform relaxation using initial lattice constant guess of a = [3.52534852] Angstroms and c = 6.908244031796494 = ([1.95959179] * a) Angstroms

     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:
setting an array element with a sequence. The requested array has an inhomogeneous shape after 1 dimensions. The detected shape was (2,) + inhomogeneous part.
     Continuing...


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

 Final lattice Constants:
   a = [3.52534852] Angstroms, c = [5.75687003] Angstroms, c/a = 1.632993

 Total energy: -8.151406013308396 eV

 Cohesive energy: -2.037851503327099 eV/atom

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