Hi,

I think you can go for JCPDS reference card help.

Here you can also get XRD pattern also from here:

http://crystdb.nims.go.jp/index_en.html

It is free of charge, you just need to register there.

You can also index your maxima with TREOR, DICVOL or ITO (included in the Fullprof Suite package) to obtain the cell parameters. If your compounds are not much complicated, you can obtain a reliable cell parameters, and them compare with those ones of the databases.

Installing PCPDFWIN software may be proven very beneficial.