[Pw_forum] relaxation doesn't keep the Wyckoff relation between related atoms.

[Paolo Giannozzi]

On May 16, 2011, at 6:58 , mayank gupta wrote:

> I have relaxed my structure but the relaxed atomic positions are not
> related by  wycoff relations, their third decimal places has been
> changed. While in some atoms even second decimal places changed. Is
> their any thing by which I can relax the structure while keeping
> symmetry constrains.

structural optimization with the BGFS algorithm keeps the symmetry

P.
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Paolo Giannozzi, Dept of Chemistry&Physics&Environment,
Univ. Udine, via delle Scienze 208, 33100 Udine, Italy
Phone +39-0432-558216, fax +39-0432-558222