Hi Rajan,

On Thu, Oct 30, 2014 at 10:07 AM, Rajan Kumar <kumarrajan...@gmail.com>
wrote:

> Hi,
>
> I want to build graphene sheet in Avogadro.
> I am able to build a hexagonal cell of the graphene structure. But when I
> create a super cell, a message pops out "The document is currently a
> isolated molecule. you need to create a unit cell"
>

Use Crystallography >> Add Unit Cell and adjust the cell parameters to
match your desired periodicity. After that, you should be able to produce a
supercell.

Hope this helps,
Dave
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