Element = Lattice = Model = Element: Na
Lattice: hcp
Model: Sim_LAMMPS_ReaxFF_BrugnoliMiyataniAkaji_SiCeNaClHO_2023__SM_282799919035_000
Computed model cutoff of 9.996428521648047 Angstroms
Computed isolated atomic energy of 0.0 eV for species Na

==============================================================================
==============================================================================
 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:
ERROR on proc 0: Neighbor list overflow, boost neigh_modify one (src/npair_half_bin_newtoff_ghost.c
Continuing...


Attempting to perform relaxation using initial lattice constant guess of a = 1.125 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 = 1.125 Angstroms
Exception message:
ERROR on proc 0: Neighbor list overflow, boost neigh_modify one (src/npair_half_bin_newtoff_ghost.c
Continuing...


Attempting to perform relaxation using initial lattice constant guess of a = 1.25 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 = 1.25 Angstroms
Exception message:
ERROR on proc 0: Neighbor list overflow, boost neigh_modify one (src/npair_half_bin_newtoff_ghost.c
Continuing...


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: -0.135422
         Iterations: 40
         Function evaluations: 85
Results for this minimization:
  a = 4.956128981336967, total energy = -0.13542209643611844

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: -0.135422
         Iterations: 41
         Function evaluations: 89
Results for this minimization:
  a = 4.9561289716512045, total energy = -0.13542209643611847

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: -0.135422
         Iterations: 41
         Function evaluations: 85
Results for this minimization:
  a = 4.956128966808324, total energy = -0.13542209643611847

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: -0.135422
         Iterations: 41
         Function evaluations: 86
Results for this minimization:
  a = 4.956128974282183, total energy = -0.13542209643611844

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: -0.135422
         Iterations: 39
         Function evaluations: 81
Results for this minimization:
  a = 4.956128988676937, total energy = -0.13542209643611844

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: -0.135422
         Iterations: 40
         Function evaluations: 83
Results for this minimization:
  a = 4.956128966715193, total energy = -0.13542209643611847

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: -0.135422
         Iterations: 39
         Function evaluations: 83
Results for this minimization:
  a = 4.956128969229759, total energy = -0.1354220964361184

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: -0.135422
         Iterations: 39
         Function evaluations: 82
Results for this minimization:
  a = 4.9561289813951594, total energy = -0.13542209643611847

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: -0.135422
         Iterations: 39
         Function evaluations: 83
Results for this minimization:
  a = 4.956128971278664, total energy = -0.13542209643611847

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: -0.135422
         Iterations: 40
         Function evaluations: 85
Results for this minimization:
  a = 4.956128980964422, total energy = -0.1354220964361184

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: -0.135422
         Iterations: 38
         Function evaluations: 81
Results for this minimization:
  a = 4.9561289856908886, total energy = -0.13542209643611836

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: -0.135422
         Iterations: 38
         Function evaluations: 82
Results for this minimization:
  a = 4.9561289854347805, total energy = -0.1354220964361184

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: -0.135422
         Iterations: 39
         Function evaluations: 83
Results for this minimization:
  a = 4.956128966942196, total energy = -0.13542209643611847

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: -0.135422
         Iterations: 38
         Function evaluations: 82
Results for this minimization:
  a = 4.956128986179833, total energy = -0.13542209643611833

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: -0.135422
         Iterations: 37
         Function evaluations: 79
Results for this minimization:
  a = 4.956128987832926, total energy = -0.13542209643611838

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: -0.135422
         Iterations: 37
         Function evaluations: 79
Results for this minimization:
  a = 4.956128981336954, total energy = -0.1354220964361185

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: -0.135422
         Iterations: 37
         Function evaluations: 79
Results for this minimization:
  a = 4.956128971651203, total energy = -0.1354220964361184

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: -0.135422
         Iterations: 36
         Function evaluations: 77
Results for this minimization:
  a = 4.9561289812903855, total energy = -0.13542209643611844

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: -0.135422
         Iterations: 36
         Function evaluations: 78
Results for this minimization:
  a = 4.95612897127867, total energy = -0.13542209643611844

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: -0.135422
         Iterations: 36
         Function evaluations: 75
Results for this minimization:
  a = 4.956128988676937, total energy = -0.1354220964361184

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: -0.135422
         Iterations: 35
         Function evaluations: 76
Results for this minimization:
  a = 4.956128980964424, total energy = -0.1354220964361184

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: -0.135422
         Iterations: 35
         Function evaluations: 74
Results for this minimization:
  a = 4.956128966808321, total energy = -0.13542209643611844

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: -0.135422
         Iterations: 36
         Function evaluations: 75
Results for this minimization:
  a = 4.956128980696665, total energy = -0.13542209643611847

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: -0.135422
         Iterations: 34
         Function evaluations: 72
Results for this minimization:
  a = 4.956128969229757, total energy = -0.1354220964361184

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: -0.135422
         Iterations: 37
         Function evaluations: 80
Results for this minimization:
  a = 4.956128984122188, total energy = -0.1354220964361184

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: -0.135422
         Iterations: 35
         Function evaluations: 76
Results for this minimization:
  a = 4.956128983490637, total energy = -0.1354220964361184

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: -0.135422
         Iterations: 33
         Function evaluations: 71
Results for this minimization:
  a = 4.956128961965443, total energy = -0.1354220964361184

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: -0.135422
         Iterations: 33
         Function evaluations: 71
Results for this minimization:
  a = 4.956128971278668, total energy = -0.13542209643611847

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: -0.135422
         Iterations: 34
         Function evaluations: 72
Results for this minimization:
  a = 4.956128971537692, total energy = -0.1354220964361186

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: -0.135422
         Iterations: 35
         Function evaluations: 76
Results for this minimization:
  a = 4.956128988065757, total energy = -0.13542209643611838

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: -0.135422
         Iterations: 34
         Function evaluations: 74
Results for this minimization:
  a = 4.956128981383517, total energy = -0.13542209643611838

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: -0.135422
         Iterations: 34
         Function evaluations: 72
Results for this minimization:
  a = 4.9561289834906335, total energy = -0.13542209643611844

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: -0.135422
         Iterations: 36
         Function evaluations: 79
Results for this minimization:
  a = 4.956128978915514, total energy = -0.1354220964361184

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: -0.135422
         Iterations: 36
         Function evaluations: 78
Results for this minimization:
  a = 4.9561289618723094, total energy = -0.1354220964361184

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: -0.135422
         Iterations: 35
         Function evaluations: 74
Results for this minimization:
  a = 4.9561289716511965, total energy = -0.13542209643611847

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: -0.135422
         Iterations: 35
         Function evaluations: 75
Results for this minimization:
  a = 4.956128966808317, total energy = -0.13542209643611844

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: -0.135422
         Iterations: 35
         Function evaluations: 74
Results for this minimization:
  a = 4.956128974445164, total energy = -0.1354220964361184

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: -0.135422
         Iterations: 36
         Function evaluations: 78
Results for this minimization:
  a = 4.956128981709478, total energy = -0.13542209643611847

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: -0.135422
         Iterations: 37
         Function evaluations: 79
Results for this minimization:
  a = 4.956128987320696, total energy = -0.13542209643611836

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: -0.135422
         Iterations: 36
         Function evaluations: 78
Results for this minimization:
  a = 4.95612898725085, total energy = -0.13542209643611838

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: -0.135422
         Iterations: 37
         Function evaluations: 77
Results for this minimization:
  a = 4.956128964875821, total energy = -0.13542209643611847

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: -0.135422
         Iterations: 36
         Function evaluations: 76
Results for this minimization:
  a = 4.956128966808318, total energy = -0.13542209643611847

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: -0.135422
         Iterations: 36
         Function evaluations: 77
Results for this minimization:
  a = 4.956128966389221, total energy = -0.13542209643611844

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: -0.135422
         Iterations: 37
         Function evaluations: 80
Results for this minimization:
  a = 4.956128971651196, total energy = -0.1354220964361185

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: -0.135422
         Iterations: 38
         Function evaluations: 84
Results for this minimization:
  a = 4.9561289951670915, total energy = -0.13542209643611833

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: -0.135422
         Iterations: 37
         Function evaluations: 79
Results for this minimization:
  a = 4.956128975749014, total energy = -0.1354220964361184

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: -0.135422
         Iterations: 38
         Function evaluations: 82
Results for this minimization:
  a = 4.95612896707607, total energy = -0.13542209643611836

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: -0.135422
         Iterations: 37
         Function evaluations: 80
Results for this minimization:
  a = 4.9561289712786625, total energy = -0.13542209643611844

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: -0.135422
         Iterations: 38
         Function evaluations: 82
Results for this minimization:
  a = 4.956128977949263, total energy = -0.13542209643611844

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: -0.135422
         Iterations: 37
         Function evaluations: 76
Results for this minimization:
  a = 4.956128988676937, total energy = -0.13542209643611844

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: -0.135422
         Iterations: 37
         Function evaluations: 78
Results for this minimization:
  a = 4.956128980830549, total energy = -0.13542209643611847

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: -0.135422
         Iterations: 38
         Function evaluations: 82
Results for this minimization:
  a = 4.956128980964415, total energy = -0.1354220964361185

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: -0.135422
         Iterations: 38
         Function evaluations: 80
Results for this minimization:
  a = 4.95612899155821, total energy = -0.1354220964361183

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: -0.135422
         Iterations: 39
         Function evaluations: 82
Results for this minimization:
  a = 4.956128966435786, total energy = -0.1354220964361184

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: -0.135422
         Iterations: 38
         Function evaluations: 80
Results for this minimization:
  a = 4.9561289716511965, total energy = -0.1354220964361184

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: -0.135422
         Iterations: 38
         Function evaluations: 79
Results for this minimization:
  a = 4.956128983385863, total energy = -0.1354220964361184

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: -0.135422
         Iterations: 38
         Function evaluations: 81
Results for this minimization:
  a = 4.956128954142322, total energy = -0.13542209643611824

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: -0.135422
         Iterations: 38
         Function evaluations: 80
Results for this minimization:
  a = 4.95612896922975, total energy = -0.13542209643611844

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: -0.135422
         Iterations: 39
         Function evaluations: 83
Results for this minimization:
  a = 4.956128983844243, total energy = -0.13542209643611838

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: -0.135422
         Iterations: 39
         Function evaluations: 84
Results for this minimization:
  a = 4.956128980964422, total energy = -0.1354220964361184

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: -0.135422
         Iterations: 41
         Function evaluations: 88
Results for this minimization:
  a = 4.956128958902269, total energy = -0.1354220964361184

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: -0.135422
         Iterations: 39
         Function evaluations: 84
Results for this minimization:
  a = 4.956128985062232, total energy = -0.13542209643611838

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: -0.135422
         Iterations: 40
         Function evaluations: 85
Results for this minimization:
  a = 4.956128981010982, total energy = -0.13542209643611836

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: -0.135422
         Iterations: 39
         Function evaluations: 84
Results for this minimization:
  a = 4.956128975749014, total energy = -0.1354220964361184

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: -0.135422
         Iterations: 39
         Function evaluations: 82
Results for this minimization:
  a = 4.9561289814300835, total energy = -0.1354220964361184

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: -0.135422
         Iterations: 39
         Function evaluations: 84
Results for this minimization:
  a = 4.956128971278671, total energy = -0.1354220964361184

Attempting to perform relaxation using initial lattice constant guess of a = 9.625 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: -0.135422
         Iterations: 39
         Function evaluations: 85
Results for this minimization:
  a = 4.956129001377838, total energy = -0.13542209643611836

Attempting to perform relaxation using initial lattice constant guess of a = 9.75 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: -0.135422
         Iterations: 39
         Function evaluations: 82
Results for this minimization:
  a = 4.956128971764694, total energy = -0.13542209643611847

Attempting to perform relaxation using initial lattice constant guess of a = 9.875 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: -0.135422
         Iterations: 39
         Function evaluations: 84
Results for this minimization:
  a = 4.956128970906136, total energy = -0.1354220964361184

Attempting to perform relaxation using initial lattice constant guess of a = 10.0 Angstroms (c/a fixed at sqrt(8/3))

Optimization terminated successfully.
         Current function value: -0.135422
         Iterations: 40
         Function evaluations: 84
Results for this minimization:
  a = 4.956128981662914, total energy = -0.13542209643611847

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


Attempting to perform relaxation using initial lattice constant guess of a = [4.95612897] Angstroms and c = 6.474659775835796 = ([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 = 10.0 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 = [4.95612897] Angstroms and c = 6.879326011825533 = ([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 = 10.0 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 = [4.95612897] Angstroms and c = 7.28399224781527 = ([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 = 10.0 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 = [4.95612897] Angstroms and c = 7.688658483805007 = ([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 = 10.0 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 = [4.95612897] Angstroms and c = 8.093324719794744 = ([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 = 10.0 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 = [4.95612897] Angstroms and c = 8.49799095578448 = ([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 = 10.0 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 = [4.95612897] Angstroms and c = 8.902657191774217 = ([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 = 10.0 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 = [4.95612897] Angstroms and c = 9.307323427763954 = ([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 = 10.0 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 = [4.95612897] Angstroms and c = 9.711989663753691 = ([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 = 10.0 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 = [4.95612897] Angstroms, c = [8.09332472] Angstroms, c/a = 1.632993

 Total energy: -0.1354220964361186 eV

 Cohesive energy: -0.03385552410902965 eV/atom

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