And if you have no experimental hint of the behavior of cell parameters at the 
interface you can start by averaging the parameters, with a (hopefully 
little) strain of both materials.

HTH

Giuseppe 

On Wednesday, September 21, 2016 03:09:49 PM Jess Wellendorff wrote:
> The VNL "Interface Builder" would make it very easy for you to build a
> minimum-strain interface:
> 
> http://docs.quantumwise.com/tutorials/ag_au_interface/ag_au_interface.html
> 
> On 09/21/2016 03:04 PM, Lorenzo Paulatto wrote:
> > Dear Lorenzo,
> > you cannot specify different periodicity, you have to build a
> > super-cell, as big as the 3x3 cell of the first material, or the 2x2
> > cell of the second, then you fill it with 9 units of the first
> > material and 4 of the other. This can be done by hand (the first time
> > it'll take you an hour or two), or there are some softwares that can
> > help you I have never used one, as hence I cannot recommend any.
> > 
> > 
> > On 21 September 2016 at 14:46, Lorenzo Pedrazzetti
> > <lorenzo.pedrazze...@polimi.it <mailto:lorenzo.pedrazze...@polimi.it>>
> > 
> > wrote:
> >     Good afternoon,
> >     
> >     I am trying to model the interface between two solid with
> >     different cella parameter. By looking at their experimental cell
> >     value I am supposed to stack a 3x3 slab onto a 2x2 slab made of
> >     different material.
> >     
> >     My problemi s the “CELL_PARAMETERS” card; i found some
> >     difficulties to understand how to specify the different
> >     periodicity of the two materials.
> >     
> >     Thanks a lot,
> >     
> >     Lorenzo.
> >     
> >     
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   Giuseppe Mattioli                            
   CNR - ISTITUTO DI STRUTTURA DELLA MATERIA   
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