[Pw_forum] internal parameter 'u'

[Eyvaz Isaev]

Dear Kajal,

--- On Tue, 1/5/10, kajal jindal <kajalmh18 at gmail.com> wrote:

> how can I determine the value of internal parameter 'u',which 
> characterizes the  length of the bond parallel to c-axis, in hexagonal
> wurtzite structure ..
 
It is quite simple: u = 0.25 + 1./3/(c/a)^2}

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