Laue Methos by X Ray Diffraction-Solid State Physics-Presentation, Slides of Solid State Physics

Download Laue Methos by X Ray Diffraction-Solid State Physics-Presentation and more Slides Solid State Physics in PDF only on Docsity! LAUE METHOD BY X-RAY DIFFRACTION  The history of this method is to cover various fundamental problems.  The Bragg’s equation does not explicitly tell us about the directions in which diffraction occurs.  Laue equations make the directionality of the process more obvious as we have a set of three equations, one for each crystallographic axis that must be simultaneously satisfied. docsity.com  X-ray source  Device to hold and manipulate crystal  detector docsity.com Condition for Laue Method » Wavelength varies » Angle= constant There are two basic technique  Back-reflection Laue technique  Transmission Laue technique docsity.com Laue Back-reflection Pattern docsity.com  In the transmission Laue method, the film is placed behind the crystal to record beams which are transmitted through the crystal. One side of the cone of Laue reflections is defined by the transmitted beam. The film intersects the cone, with the diffraction spots generally lying on an ellipse. docsity.com Diagram of Laue Transmission The Laue method docsity.com  Fast and easy to use  It is used for the identification of FCC and BCC  To study the extent of crystalline imperfection  To identify Crystal orientation Planes orientation symmetry docsity.com  Extremely short data collection time-resolved crystallography  A few exposures covers reciprocal space specially for high symmetry space group  Reciprocal lattice concept  Ewald’s sphere concept docsity.com