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What does PDF stand for?

PDF stands for Powder Diffraction Files

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Once all d-spacings have been determined, automated search/match routines compare the ds of the unknown to those of known materials. Because each mineral has a unique set of d-spacings, matching these d-spacings provides an identification of the unknown sample. A systematic procedure is used by ordering the d-spacings in terms of their intensity beginning with the most intense peak. Files of d-spacings for hundreds of thousands of inorganic compounds are available from the International Centre for Diffraction Data as the Powder Diffraction File.
In order to meet the individual need of diffractionists worldwide, the Powder Diffraction File™ is available on a variety of media - books, CD-ROM, and DVD. The PDF has various subfiles of data which include, but are not limited to, minerals, metals and alloys, and forensic materials. There is also an educational package for classroom use. Various methods, including the use of printed indexes and computer software, enable users to match data in the File with their laboratory data.