MSE2020LectureNotes_3_17

MSE2020LectureNotes_3_17 - M SE 2020 3/17/2010 Page 1 of 2...

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MSE 2020 3/17/2010 Page 1 of 2 X-ray λ is on the order/close to lattice parameters Diffraction patterns o SiO 2 glass – random arrangement, random peaks (plateau) n = λ 2dsinθ = d nλ2sinθ (interplanar spacing) Angle between incident and diffracted beam/detector = 2 θ 1 st peak corresponds to a specific inter-lamellar spacing (plane) Different diffraction profiles mean different atomic spacing Only thing being changed in experiment is angle Peak doesn’t tell you which plane Broadening (like in amorphous glass, random peaks) o Means lack of crystallinity/defects Lattice is a mathematical model of how atoms can be arranged in space Planes can be represented by their normal vectors Recall symmetry operations
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MSE 2020
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MSE2020LectureNotes_3_17 - M SE 2020 3/17/2010 Page 1 of 2...

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