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   ndtset   3
# Set 1 : Initial self-consistent run
    iscf1   7
  kptopt1   1
  tolvrs1   1.0d-18  #need excellent convergence of GS quantities for RF runs
# Set 2 : Calculate the ddk wf's - needed for piezoelectric tensor and
#         Born effective charges in dataset 3
  getwfk2  -1
    iscf2  -3        #this option is needed for ddk
  kptopt2   2        #use time-reversal symmetry only for k points
    nqpt2   1        #one wave vector will be specified
     qpt2   0 0 0    #need to specify gamma point
  rfelfd2   2        #set for ddk wf's only
   rfdir2   1 1 1    #full set of directions needed
   # rfdir2   1 0 0
  tolwfr2   1.0d-16  #only wf convergence can be monitored here
# Set 3 : response-function calculations for all needed perturbations
  getddk3  -1
  getwfk3  -2
    iscf3   7
  kptopt3   2        #use time-reversal symmetry only for k points
    nqpt3   1
     qpt3   0 0 0
  rfphon3   1        #do atomic displacement perturbation
rfatpol3   1 8      #do for all atoms
  rfstrs3   3        #do strain perturbation
    rfdir3   1 1 1    #the full set of directions is needed
#   rfdir3   1 0 0   
tolvrs3   1.0d-10  #need reasonable convergence of 1st-order quantities
#Common input data
# acell  COPY RELAXED RESULT FROM PREVIOUS CALCULATION
# Here is a default value, for automatic testing : suppress it and fill the previous line
  acell  10.274  10.274  20.250
#  rprim   sqrt(0.75)  0.5  0.0   #hexagonal primitive vectors must be
#         -sqrt(0.75)  0.5  0.0   #specified with high accuracy to be
#          0.0         0.0  1.0   #sure that the symmetry is recognized
                                 #and preserved in the optimization
                                 #process
  angdeg  90 90 90
  spgroup 122
  brvltt -1
  chkprim 0
#Definition of the atom types and atoms
  ntypat   3
  znucl   48 32 33
  natom   8
  typat   1  2  3
#Starting approximation for atomic positions in REDUCED coordinates
#based on ideal tetrahedral bond angles
# xred  COPY RELAXED RESULT FROM PREVIOUS CALCULATION
# Here is a set of default values, for automatic testing : suppress it and fill the previous line
  natrd  3
  xred  0.0    0.0    0.0
        0.0    0.0    0.5
        0.27 0.25   0.125
#Gives the number of bands, explicitely (do not take the default)
  nband   30            
#Definition of the plane wave basis set
   ecut   45.0            # Maximum kinetic energy cutoff (Hartree)
ecutsm   0.5            
#Definition of the k-point grid
kptopt   1              # Use symmetry and treat only inequivalent points
ngkpt   4 4 4          # 4x4x4 Monkhorst-Pack grid
nshiftk   1              # Use one copy of grid only (default)
shiftk   0.0 0.0 0.0  
#Definition of the self-consistency procedure
diemac   12.0            # Model dielectric preconditioner
   iscf   7              # Use conjugate-gradient SCF cycle
   nstep   4000             # Maxiumum number of SCF iterations
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      iter   2DEtotal(Ha)        deltaE(Ha) residm    vres2
-ETOT  1  -45.484530143467     -4.548E+01 6.521E-01 0.000E+00
ETOT  2  -45.795933477839     -3.114E-01 1.429E-01 0.000E+00
ETOT  3  -45.815094454386     -1.916E-02 1.606E-02 0.000E+00
ETOT  4  -45.817797043619     -2.703E-03 7.576E-02 0.000E+00
ETOT  5  -45.818278447453     -4.814E-04 1.092E-02 0.000E+00
ETOT  6  -45.818372532096     -9.408E-05 6.982E-02 0.000E+00
ETOT  7  -45.818391953073     -1.942E-05 9.658E-03 0.000E+00
ETOT  8  -45.818396113087     -4.160E-06 6.921E-02 0.000E+00
ETOT  9  -45.818397027188     -9.141E-07 9.109E-03 0.000E+00
ETOT 10  -45.818397231562     -2.044E-07 6.907E-02 0.000E+00
ETOT 11  -45.818397277798     -4.624E-08 8.879E-03 0.000E+00
ETOT 12  -45.818397288342     -1.054E-08 6.898E-02 0.000E+00
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Originally posted by yy08 at 2011-07-21 23:38:46:
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liliangfang: ½ð±Ò+2, лл½»Á÷ 2012-08-05 14:38:49
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