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IBRION    =  8
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LRPA = .FALSE. to my INCAR.

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PIEZOELECTRIC TENSOR  for field in x, y, z        (C/m^2)
          XX          YY          ZZ          XY          YZ          ZX
  --------------------------------------------------------------------------------
  x    -0.00000     0.00000     0.00000    -0.14610    -0.00000    -0.23452
  y    -0.14610     0.14610     0.00000     0.00000    -0.23436     0.00000
  z     0.09370     0.09370    -0.58201     0.00000    -0.00000     0.00000

PIEZOELECTRIC TENSOR IONIC CONTR  for field in x, y, z        (C/m^2)
          XX          YY          ZZ          XY          YZ          ZX
  --------------------------------------------------------------------------------
  x     0.00006    -0.00006     0.00000    -0.82610    -0.00003     2.03157
  y    -0.82613     0.82623     0.00006     0.00000     1.95759     0.00000
  z     1.85061     1.85061     2.80408     0.00000     0.00000    -0.00000

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