DFT codes need a crystal structure as input. How do we provide that input? And where do we find crystal structure information?
Do as described at the end of the video: search the cif file of KNa2LiTi2Fe2(SiO3)8, inspect a picture of the unit cell, and download the cif file to your computer. Consider your favourite DFT code, and convert this cif file into an input file for that code (quite likely, this unit cell will be too demanding to run an actual DFT calculation, so you don’t need to do that).
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This is a list of repositories for cif files :