Thank you for your replies and suggestions. I will look further into determining the atomic structure of the Hf-Al intermetallics through their papers.

Once I obtain this information, how do I go about creating the actual CIF file? Can I just open up any arbitrary CIF file and then change the parameters and name to match that of the Hf-Al systems?

Lastly, going through some CIF files from crystallography.net, I notice that some of the 3D models from the CIF has a different stoichiometry from the designated crystal. For example, I have attached a CIF file of SiO2 that I have found; however, the 3D representation only has 1 Silicon atom and 1 Oxygen atom. Do you have any insight on this disparity?

Regards,
Ed Han