Chemical Crystallography Powder analysi STADI-P Stoe Powder diffractometer Powder X-ray Diffraction Information from Powder XrD AMeasuring samples consisting of a collection of many small crystallites with random orientations. i Phase purity crystallinity of materials both qualitative and quantitative E Crystallinity amorphous content, particle size and strain sured powder patterns can be compared to a n Unit cell size and shape from peak position .Advantages over Single Crystal Diffraction It is usually much easier to prepare a powder sample You are guaranteed to see all reflections The Deby s wn eau Sherrer Amorphous Polycrystalline Crystalline7 STADI-P Stoe Powder diffractometer powder sample in glass capillary Chemical Crystallography ¾¾ Powder Analysis powder Powder X-ray Diffraction Measuring samples consisting of a collection of many small crystallites with random orientations. Powder XRD is used routinely to assess the purity and crystallinity of materials Each crystalline phase has a unique powder diffraction pattern Measured powder patterns can be compared to a database for identification ßAdvantages over Single Crystal Diffraction It is usually much easier to prepare a powder sample. You are guaranteed to see all reflections. Information from Powder XRD Phase purity –both qualitative and quantitative Crystallinity –amorphous content, particle size and strain Unit cell size and shape –from peak positions 20 30 40 5 0 60 70 80 0 10000 20000 30000 40000 50000 20 3 0 40 50 6 0 70 80 0 50 100 150 200 20 30 40 50 60 70 80 200 400 600 800 1000 1200 1400 1600 1800 2000 Amorphous Polycrystalline Crystalline The Debye￾Sherrer Camera