[Pw_forum] lattice constant from unit cell vs. from supercell

Chad Junkermeier junkermeier at bloch.nrl.navy.mil
Wed Mar 17 18:40:03 CET 2010


I copied the wrong file into the original email.  In the 2x2 unit cell  
case the atoms started out in the following positions.

ATOMIC_POSITIONS crystal
C       0.0     0.0     0.0
C       0.1666666666666667      0.3333333333333333      0.0
C       0.0     0.5     0.0
C       0.1666666666666667      0.8333333333333333      0.0
C       0.5     0.0     0.0
C       0.6666666666666667      0.3333333333333333      0.0
C       0.5     0.5     0.0
C       0.6666666666666667      0.8333333333333333      0.0
F       0.0     0.0     0.05
F       0.0     0.5     0.05
F       0.5     0.0     0.05
F       0.5     0.5     0.05





On Mar 17, 2010, at 1:25 PM, Duy Le wrote:

> Not really sure if I understand your question. However, there seems to
> be an incorrectness.
> Simple logic:
> 1F, 2 C in a "1x1" supercell
> 4F, 8 C in a "2x2" supercell
> --------------------------------------------------
> Duy Le
> PhD Student
> Department of Physics
> University of Central Florida.
>
> "Men don't need hand to do things"
>
>
>

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