A crystallographic database is a database specifically designed to store information about the structure of molecules andcrystals. Crystals are solids having, in all three dimensions of space, a regularly repeating arrangement of atoms, ions, ormolecules. They are characterized by symmetry, morphology, and directionally dependent physical properties. A crystal structure describes the arrangement of atoms, ions, or molecules in a crystal. (Molecules need to crystallize into solids so that their regularly repeating arrangements can be taken advantage of in X-ray, neutron, and electron diffraction basedcrystallography.)

Crystal structures of crystalline material are typically determined from X-ray or neutron single-crystal diffraction data and stored in crystal structure databases. They are routinely identified by comparing reflection intensities and lattice spacings from X-ray powder diffraction data with entries in powder-diffraction fingerprinting databases.

Crystal structures of nanometer sized crystalline samples can be determined via structure factor amplitude information fromsingle-crystal electron diffraction data or structure factor amplitude and phase angle information from Fourier transforms ofHRTEM images of crystallites. They are stored in crystal structure databases specializing in nanocrystals and can be identified by comparing zone axis subsets in lattice-fringe fingerprint plots with entries in a lattice-fringe fingerprintingdatabase.

Crystallographic databases differ in access and usage rights and offer varying degrees of search and analysis capacity. Many provide structure visualization capabilities. They can be browser based or installed locally. Newer versions are built on the relational database model and support the Crystallographic Information File (CIF) as a universal data exchange format.

Hi,

I think this site may be good for you

http://cryoem.janelia.org/pages/MicroED

Thanks of all.

I have a nanocomposite layer of anatase TiO2, C and Pt. The laboratory's assistant gave me a TEM diffraction pattern of the layer without scale bar (the attached file). I would like to identify the presence of Pt in the layer from this diffraction pattern. Has everyone any idea?

S/A, For Binding Energy, use Gatan software go to tab EELS then Quantification / EELS Atlas

It is hard to explain your TEM SAED pattern here but it can be calculated. I am hereby attaching the file for SAED pattern calculation without scale bar containing image. I marked it with yellow color. Please read patiently it helps you a lot.