e-PDF software suite uses Electron Pair Distribution Function (electron diffraction based technique) that allows to analyze local order in amorphous and nanocrystalline materials from diffuse or ring ED patterns.

Understanding and possible prediction of material physical properties depends upon the knowledge of the local atomic arrangement and crystal structure. Study of nanocrystalline or amorphous materials can be performed with techniques like Pair Distribution Function (PDF) that is used to solve local atomic arrangement by using X-Ray, neutron or electron diffraction (ED) sources. ED related PDF (e-PDF) in Transmission Electron Microscope (TEM) has the advantage over X- Ray PDF technique that allows studying ordering of nanocrystalline materials at very small local scale (nm scale instead of mm ) by collecting (ED) patterns in very short time (ms instead of hours with conventional X-Ray Au or Mo sources). e-PDF has been recently applied to study nanoparticles and amorphous materials and has been established that e-PDF patterns match well equivalent X-Ray PDF patterns. However, local structure information quality based on e-PDF analysis, may be affected by dynamical effects present in ED that affect e-PDF peaks height. In this work we apply e-PDF analysis to study local order on various amorphous and crystalline materials ; in particular we study the influence of Precession Electron Diffraction (PED) to obtain reliable e-PDF local order analysis by lowering dynamical electron diffraction effects.