Element = Lattice = Model = Element: Pb
Lattice: hcp
Model: EAM_Dynamo_LandaWynblattSiegel_2000_AlPb__MO_699137396381_006
Computed model cutoff of 5.527751944959174 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: -8.120016
         Iterations: 39
         Function evaluations: 81
Results for this minimization:
  a = 3.4712736427784012, total energy = -8.120015680938861

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: -8.120016
         Iterations: 41
         Function evaluations: 88
Results for this minimization:
  a = 3.471273651346564, total energy = -8.120015680938861

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: -8.120016
         Iterations: 41
         Function evaluations: 87
Results for this minimization:
  a = 3.4712736047804356, total energy = -8.12001568093886

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: -8.120016
         Iterations: 39
         Function evaluations: 85
Results for this minimization:
  a = 3.4712736378423967, total energy = -8.120015680938863

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: -8.120016
         Iterations: 41
         Function evaluations: 87
Results for this minimization:
  a = 3.471273638214921, total energy = -8.120015680938865

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: -8.120016
         Iterations: 38
         Function evaluations: 81
Results for this minimization:
  a = 3.471273638214919, total energy = -8.120015680938863

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: -8.120016
         Iterations: 40
         Function evaluations: 85
Results for this minimization:
  a = 3.4712736561894415, total energy = -8.12001568093885

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: -8.120016
         Iterations: 37
         Function evaluations: 79
Results for this minimization:
  a = 3.4712736066430807, total energy = -8.120015680938858

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: -8.120016
         Iterations: 39
         Function evaluations: 82
Results for this minimization:
  a = 3.4712736379355222, total energy = -8.12001568093886

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: -8.120016
         Iterations: 37
         Function evaluations: 80
Results for this minimization:
  a = 3.4712736336514367, total energy = -8.120015680938854

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: -8.120016
         Iterations: 37
         Function evaluations: 81
Results for this minimization:
  a = 3.4712736077082815, total energy = -8.120015680938861

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: -8.120016
         Iterations: 38
         Function evaluations: 82
Results for this minimization:
  a = 3.4712736422574357, total energy = -8.120015680938861

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: -8.120016
         Iterations: 36
         Function evaluations: 76
Results for this minimization:
  a = 3.4712736047804356, total energy = -8.120015680938858

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: -8.120016
         Iterations: 37
         Function evaluations: 79
Results for this minimization:
  a = 3.471273637935521, total energy = -8.120015680938861

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: -8.120016
         Iterations: 36
         Function evaluations: 79
Results for this minimization:
  a = 3.4712736532092117, total energy = -8.120015680938852

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: -8.120016
         Iterations: 35
         Function evaluations: 78
Results for this minimization:
  a = 3.4712736036628487, total energy = -8.120015680938856

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: -8.120016
         Iterations: 36
         Function evaluations: 79
Results for this minimization:
  a = 3.471273655816913, total energy = -8.120015680938852

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: -8.120016
         Iterations: 33
         Function evaluations: 70
Results for this minimization:
  a = 3.4712736029177904, total energy = -8.12001568093885

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: -8.120016
         Iterations: 32
         Function evaluations: 69
Results for this minimization:
  a = 3.471273639425636, total energy = -8.120015680938861

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: -8.120016
         Iterations: 32
         Function evaluations: 69
Results for this minimization:
  a = 3.4712736071320247, total energy = -8.12001568093886

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: -8.120016
         Iterations: 33
         Function evaluations: 70
Results for this minimization:
  a = 3.4712736561894415, total energy = -8.120015680938849

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: -8.120016
         Iterations: 33
         Function evaluations: 70
Results for this minimization:
  a = 3.4712736106012008, total energy = -8.120015680938858

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: -8.120016
         Iterations: 33
         Function evaluations: 72
Results for this minimization:
  a = 3.4712736066430807, total energy = -8.120015680938854

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: -8.120016
         Iterations: 34
         Function evaluations: 72
Results for this minimization:
  a = 3.471273642801678, total energy = -8.120015680938856

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: -8.120016
         Iterations: 36
         Function evaluations: 75
Results for this minimization:
  a = 3.4712736394256347, total energy = -8.120015680938861

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: -8.120016
         Iterations: 34
         Function evaluations: 73
Results for this minimization:
  a = 3.4712736304791187, total energy = -8.12001568093886

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: -8.120016
         Iterations: 36
         Function evaluations: 79
Results for this minimization:
  a = 3.47127363285981, total energy = -8.120015680938854

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: -8.120016
         Iterations: 36
         Function evaluations: 79
Results for this minimization:
  a = 3.4712736441288143, total energy = -8.120015680938852

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: -8.120016
         Iterations: 38
         Function evaluations: 85
Results for this minimization:
  a = 3.471273638040291, total energy = -8.12001568093886

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: -8.120016
         Iterations: 37
         Function evaluations: 79
Results for this minimization:
  a = 3.4712736139073956, total energy = -8.120015680938863

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: -8.120016
         Iterations: 37
         Function evaluations: 79
Results for this minimization:
  a = 3.4712736422574393, total energy = -8.12001568093886

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: -8.120016
         Iterations: 37
         Function evaluations: 80
Results for this minimization:
  a = 3.4712736107467186, total energy = -8.12001568093886

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: -8.120016
         Iterations: 37
         Function evaluations: 77
Results for this minimization:
  a = 3.4712736047804356, total energy = -8.120015680938858

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: -8.120016
         Iterations: 37
         Function evaluations: 78
Results for this minimization:
  a = 3.4712736018002, total energy = -8.120015680938856

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: -8.120016
         Iterations: 38
         Function evaluations: 80
Results for this minimization:
  a = 3.4712736379355174, total energy = -8.120015680938856

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: -8.120016
         Iterations: 39
         Function evaluations: 84
Results for this minimization:
  a = 3.47127363549662, total energy = -8.120015680938858

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: -8.120016
         Iterations: 38
         Function evaluations: 83
Results for this minimization:
  a = 3.47127360301092, total energy = -8.120015680938854

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: -8.120016
         Iterations: 38
         Function evaluations: 82
Results for this minimization:
  a = 3.471273604722228, total energy = -8.120015680938854

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


Attempting to perform relaxation using initial lattice constant guess of a = [3.47127364] Angstroms and c = 4.53485289130725 = ([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 = 5.625 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 = [3.47127364] Angstroms and c = 4.818281197013953 = ([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 = 5.625 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 = [3.47127364] Angstroms and c = 5.101709502720657 = ([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 = 5.625 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 = [3.47127364] Angstroms and c = 5.38513780842736 = ([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 = 5.625 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 = [3.47127364] Angstroms and c = 5.668566114134063 = ([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 = 5.625 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 = [3.47127364] Angstroms and c = 5.951994419840767 = ([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 = 5.625 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 = [3.47127364] Angstroms and c = 6.23542272554747 = ([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 = 5.625 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 = [3.47127364] Angstroms and c = 6.518851031254173 = ([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 = 5.625 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 = [3.47127364] Angstroms and c = 6.8022793369608765 = ([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 = 5.625 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 = [3.47127364] Angstroms, c = [5.66856611] Angstroms, c/a = 1.632993

 Total energy: -8.120015680938865 eV

 Cohesive energy: -2.030003920234716 eV/atom

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