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Geometry optimization with periodicity?

Hello,

would it be please possible to have geometry optimization with periodicity included ? Let say, optimization of crystal structures.

Right now, Avogadro heavily uses Open Babel for geometry optimization, which doesn’t (yet) have any periodic force fields.

I’m working on a new plugin system for geometry optimization, which will allow periodicity.
(e.g., you’ll be able to write a bit of Python glue to use other programs for energies, forces, etc. - and get the unit cell parameters).

Is there a particular program you’d use for optimization of periodic structures?