I have a 9 x 9 x 9 periodic crystal structure in .xyz format and I would like to change it to .cif file format.
Does anyone know how to convert the file? (e.g. 9 x 9 x 9 to unit cell then cif)
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You can use for example pymatgen in python to do this. The tricky part of your question is to find a unit cell in step 2.
I outline the steps here:
There are probably quite a few software packages that automate this process. One I like to use is c2x, which provides support for structure files for multiple DFT packages (VASP, QE, Abinit, Castep, etc.) and visualization tools (VESTA, XCrysDen, JMol, etc.). You can download it from their website: https://www.c2x.org.uk
You can upload your .xyz file into VESTA, then under the Edit -> Edit Data, you can find the Unit Cell option. Then you can export your data to a .cif format under the File tab.