Dear VV

You can find CIF files for Sn3O4 online, on sites such as COD, IUCr Journals and CrystalMaker. I suggest doing a quick google search to find exactly what you're looking for.

R. Sagayaraj If it's so simple on Google, then please provide the appropriate link or the actual file... There are RG articles that may be helpful as they show the correct position of the peaks. For example:

The card # is JCPDS 16-0737

Article Nanostructured layered Sn 3 O 4 for hydrogen production and ...

Also Figure 1 in (also attached):

https://pubs.rsc.org/en/content/articlepdf/2020/ra/d0ra05576j

I recommend the Materials projects website: https://materialsproject.org/materials

it is possible to download cif files, but it is calculated, predicted structures

mp-1179450 is the structure of tetragonal Sn3O4,

mp-1104544 is a monoclinic modification

there are others like Sn5O6, Sn5O7, etc.