CCDC is the best source for crystal structures - unfortunately it's nor free. If your institute does not have acess to it, you can use the form available at: https://summary.ccdc.cam.ac.uk/structure-summary-form to request a specific structure: to do that you need DOI of the paper where these structures were published.

 Thank you so much Bartosz.

Hi, Priyanka!

Bartosz is correct that the Cambridge Structural Database (abbreviated CSD; maintained by Cambridge Crystallographic Data Centre, CCDC) is a good source for crystallographic structures, but the crystallographic information for strictly inorganic compounds is collected in the Inorganic Crystal Structure Database (ICSD), another a commercial product.

A free/open access counterpart to the two sources listed above is the Crystallography Open Database (COD). There are a fair amount of structures in this one, but it does not include everything in CSD and ICSD. (see link)

As for boron, there are currently 32 boron structures listed in ICSD and 18 in COD (with multiple overlaps). These may or may not cover the more than 20 allotropes of boron described to date. To retrieve the ones in COD, simply enter B for boron as the only of up to eight elements possible and restrict the search to one element (distinct elements min = 1 and max = 1). If you are missing one allotrope structure in particular, let us know.

regards,

Daniel

http://www.crystallography.net/