MSE2020LectureNotes_3_15 - MSE 2020 3/15/2011 Page 1 of 4...

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MSE 2020 3/15/2011 Page 1 of 4 First XRD lab is the week after Spring Break. We are having 2 XRD labs. X-ray Diffraction We can take advantage of order in a material If you want to know something about order in a material, use diffraction techniques If material is not crystalline, diffraction is not useful o However, you can get a lot of info about amorphous materials if you study the crystalline form of the material Taking advantage of symmetry in nature Bravais Lattices and Unit cells Crystal structure has two elements o Basis – internal information within each lattice point o Lattice – organization of unique points within the space we are considering (each lattice contains unique info about the material) Unit cell – smallest translatable group of lattice points Pentagon cannot be used to tile in 2D because it will create empty space How would material be organized if it was tiled in 3D? o Think about most efficient packing of three points in 2D o Geometrically most dense packing in 2D is triangle o 3D – tetrahedron o However, cannot fill all 3D space with just tetrahedron – leaves empty space
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This note was uploaded on 09/12/2011 for the course MSE 2020 taught by Professor Alamgir during the Spring '09 term at Georgia Institute of Technology.

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MSE2020LectureNotes_3_15 - MSE 2020 3/15/2011 Page 1 of 4...

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