lect15_reel5_3pg

lect15_reel5_3pg - Crystal Structures & X-ray XDiffraction...

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1 Crystal Structures & X -ray ray Diffraction Diffraction Chemistry 123 Spring 2008 Dr. Woodward Crystals Crystals Crystalline Solids Crystalline Solids Crystal Lattice – A 3D array of points where each point has an identical environment. Unit Cell – The repeating unit (a unit cell is to a crystal, like a “brick” is in a house). In a given crystal all unit cells are identical. CaF CaF 2 Unit Cell
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3D Crystal 3D Crystal Systems (7) Systems (7) Cubic Cubic Tetragonal Hexagonal Rhombohedral Rhombohedral Orthorhombic Orthorhombic Monoclinic Monoclinic Triclinic Triclinic 14 14 Bravais Lattices Lattices Cubic The crystal systems each have distinctive symmetry and unit cell dimensions X-ray Diffraction ray Diffraction Diffraction Demo Diffraction Demo Take home message • The diffraction pattern is related but not equal to the grid pattern • For crystals X-rays have a wavelength comparable to spacings of atoms
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This note was uploaded on 06/03/2011 for the course CHM 123 taught by Professor Woodward during the Spring '08 term at Ohio State.

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lect15_reel5_3pg - Crystal Structures & X-ray XDiffraction...

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