Hi,
--- On Sun, 8/23/09, Duy Le <ttduyle at gmail.com> wrote:
>How about the forces acting on the atoms in 2 cases? Are they too >different?
There are no forces in CaF2 (antifluorite) type structure due to its high
symmetry.
Bests,
Eyvaz.
-------------------------------------------------------------------
Prof. Eyvaz Isaev,
Theoretical Physics Department, Moscow State Institute of Steel & Alloys,
Russia,
Department of Physics, Chemistry, and Biology (IFM), Linkoping University,
Sweden
Condensed Matter Theory Group, Uppsala University, Sweden
Eyvaz.Isaev at fysik.uu.se, isaev at ifm.liu.se, eyvaz_isaev at yahoo.com
