[Wien] AFM problem of Fe2O3

swati chaudhury swati at rcais.res.in
Mon Dec 3 13:36:31 CET 2007


  Dear all Wien users,
               Please help me.How can I proceed afm calculation of Fe2O3? scf does not run with runafm. I have got a message equivalent position not found 0.14807920   0.14807920 0.14807920 in case.outputafminput file and case.inclmcopy file is also blank. What is the wrong with the calculation? Is the structure file not correct or anything else? 
  At first step I have taken the following structure file: 
   
  Fe1: 0.14807920    0.14807920   0.14807920
          0.85192080    0.85192080   0.85192080
          0.64807920    0.64807920   0.64807920
          0.35192080    0.35192080   0.35192080
  O 2: 0.94375200    0.55624800   0.25000000
          0.55624800    0.25000000   0.94375200
          0.25000000    0.94375200   0.55624800
          0.05624800    0.44375200   0.75000000
          0.44375200    0.75000000   0.05624800
          0.75000000    0.05624800   0.44375200 
  Space group 167 R-3c
   After lstart this structure is changed to case.structure_supergroup. Then I have adopted a new structure file, which is given below:
   
  Fe1: 0.14807920    0.14807920   0.14807920
          0.85192080    0.85192080   0.85192080
  Fe2: 0.64807920    0.64807920   0.64807920
          0.35192080    0.35192080   0.35192080
  O:    0.94375200    0.55624800   0.25000000
          0.55624800    0.25000000   0.94375200
          0.25000000    0.94375200   0.55624800
          0.05624800    0.44375200   0.75000000
          0.44375200    0.75000000   0.05624800
          0.75000000    0.05624800   0.44375200 
  space groyup of the system 148 R-3
  Number of symmetry is 6, whereas in case.struct_supergroup it is 12. 
      case.inst file is also modified with flipping. case.inst file is given below (after flipping)
  Fe 1
  Ar 3
  3,  2,2.0  N
  3,  2,2.0  N
  3, -3,2.5  N 
  3, -3,0.0  N
  4, -1,1.0  N
  4, -1,0.5  N
  Fe 2
  Ar 3
  3,  2,2.0  N
  3,  2,2.0  N
  3, -3,0.0  N 
  3, -3,2.5  N
  4, -1,0.5  N
  4, -1,1.0  N
  O  3
  He 3
  2, -1,1.0  N
  2, -1,1.0  N
  2,   1,1.0  N 
  2,   1,1.0  N
  2, -2,1.0  N
  2, -2,1.0  N
  Please suggest.
  Swati.

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