hi roberto,

                   I think that you may replace Et(1) by E(64)/64. perhaps the 
other users can correct me, if I am making a mistake...

best regards,

                        pablo
  ----- Original Message ----- 
  From: Roberto Veiga 
  To: SIESTA-L@listserv.uam.es 
  Sent: Friday, August 01, 2008 10:08 AM
  Subject: [SIESTA-L] Vacancy formation energy


  Hi, everybody:


  I would like to calculate the formation energy for a single vacancy in 
bcc-iron (64-atoms supercell). The more obvious way (at least it is what I 
think) is to use the following equation:


  Ef=Et(64)-Et(63)-Et(1), where Et(1) is the total energy of the 1-atom unit 
cell.


  Is it OK? Is it completely wrong?


  Roberto Veiga
  PhD student
  INSA-Lyon



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