ICDD’s search indexing software, SIeve+ for PDF-4+, is designed to search and identify unknown materials. Ludo Frevel Crystallographic Scholarship.Grant-in-Aid Recipients and Award Winners.NIST XRD SRM Powder Diffraction Journal Publications.Current Research Using the Powder Diffraction File.PreDICT with DICVOL14 Indexing (freeware).Pharmaceutical Powder X-ray Diffraction Symposium (PPXRD).Powder Diffraction File (PDF) – Phase Search.