[Pw_forum] Problem regarding identification of space group of Zr15Nb1 cell

[Krishnendu Mukherjee]

Respected Dr. M. Mehl,

 Thank you very much for your kind reply.

--------------------------------------------------------------------------------------------


It's impossible for space group #194 to have 15 atoms of one species and 1
atom of another species -- there aren't any Wyckoff positions in P6_3/mmc
that contain only one point.

What you've done eliminates the inversion operation, which changes #194 to
#187.

Take a look at both space groups in the International Tables or
http://www.cryst.ehu.es/cryst/get_wp.html and you'll see this.

On Fri, Feb 9, 2018 at 4:48 AM, Krishnendu Mukherjee <
krishnendu.mukherjee789 at gmail.com> wrote:

>
> Dear Experts,
>
>  I have created a Zr15Nb1 cell containing 15 Zr atoms and 1 Nb atom using
> the space group P 63/m m c, (space group number 194).
>
>  But, when I try to calculate the elastic constant of it using the
> thermo_pw, I find, pwscf recognizes wrong space group (No. 187). Please
> find below my input:

-- 
Dr. Krishnendu Mukherjee,

Principal Scientist,
CSIR-NML,
Jamshedpur.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.quantum-espresso.org/pipermail/users/attachments/20180213/0afd9a76/attachment.html>