DETERMINATION OF CRYSTAL STRUCTURE
Introduction
X-ray
The atomic planes of a crystal cause incident X-rays to interfere with one another as they leave the crystal.
Generation
-Deceleration of e in the metal target.
-Non-elastic excitation of e in the target atoms
X-ray spectrum
Neutron
Neutron is used to study magnetic structure of
materials – based on its magnetic moment.
Spectrum of slow neutron
Electron
Short penetration power
Suitable for surface study of crystals, thin films and
thin crystals
Diffraction
Wave Interacting with a Single Particle
Incident beams scattered uniformly in all
directions
Wave Interacting with a Solid
Scattered beams interfere constructively in some
directions, producing diffracted beams.
Crystalline Material
Diffraction pattern gives information on crystal
structure
Bragg's Law
Reciprocal lattice
Indices of the atomic planes
The miller indices(hkl) represent a particular set of equivalent parall planes.
d-Spacing in different crystal systems
Ewald construction
Laue Equations
Ewald sphere of Diffracrion
Experimental Diffraction Technique
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