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

Take a look at both space groups in the International Tables or and you'll see this.

On Fri, Feb 9, 2018 at 4:48 AM, Krishnendu Mukherjee <> 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,
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