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Crystallography Open Database
http://www.crystallography.net/cod/
To visualize the crystal stucture, better to use avogadro(http://avogadro.cc/wiki/Main_Page). Note that avogadro has some problem with handling LAMMPS input data file.
OVITO(http://www.ovito.org/) is the best one to visualize the LAMMPS input file and its output file as well. Open software.
In order to construct LAMMPS input file, recommend moltemplate(http://www.moltemplate.org/). It requires your knowledge in crystallography.
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