# Export geometry to LAMMPS format

**URL:** <https://discuss.avogadro.cc/t/export-geometry-to-lammps-format/384>\
**Category:** General Discussion\
**Created:** [February 4, 2015, 1:31pm UTC](https://discuss.avogadro.cc/t/export-geometry-to-lammps-format/384 "2015-02-04T13:31:15Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Marcos\_Verissimo\_Alv](https://discuss.avogadro.cc/letter_avatar_proxy/v4/letter/m/9dc877/32.png) [@Marcos\_Verissimo\_Alv](https://discuss.avogadro.cc/u/Marcos_Verissimo_Alv)\
**Post date:** [February 4, 2015, 1:31pm UTC](https://discuss.avogadro.cc/t/export-geometry-to-lammps-format/384/1 "2015-02-04T13:31:15Z")

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Hi all,

My name is Marcos and I am a new user to Avogadro. I have just created a  
simple graphene structure (unit cell, 2 atoms) in order to start using the  
code. Took me a bit of trial and error, but now I think I got the hang of  
it. The main reason I started using Avogadro is because I had read in the  
LAMMPS website that it could create input files for it.

I’ve been searching the mailing list for posts on the creation of input  
files for LAMMPS, and I saw a post from 2014 by Prof. Hutchison saying that  
feedback from users would be useful in improving the LAMMPS input file  
generator. Here are my 10 cents on the subject 🙂

I am also a new user of LAMMPS, and I have to say: LAMMPS is a pretty  
cryptical code to work with. I’m continuously biting the dust with it,  
mostly because of one crucial part: coordinate and cell generation. It’s  
really hard to create coordinates and cell specifications in LAMMPS for  
non-cubical cells.

Graphene is my workhorse, and the primitive cell has two vectors at 120  
degrees with each other. While the cell vectors are not difficult to  
specify in LAMMPS, my difficulty lies in creating the atoms in the cell. I  
am especially confused as to how to do what I really need, which is to  
place two hydrogen atoms on top of the carbons (generating graphane).

So, for me, as a new user, a great thing to be implemented in Avogadro  
would be inclusion of cell and atomic coordinate specifications in the  
generated input file - something I was quite disappointed to find out  
doesn’t exist in Avogadro (at least in version 1.1.1 installed as a debian  
package in the latest Xubuntu distro). As far as I could tell, Abinit file  
generation does generate the coordinates.

Best regards,

Marcos

* * *

Prof. Dr. Marcos Verissimo Alves  
Prof. Adjunto II, Curso de Física Computacional  
Instituto de Ciências Exatas, Polo Universitário de Volta Redonda  
Universidade Federal Fluminense  
Volta Redonda - RJ, Brasil