MSE2020LectureNotes_4_7

MSE2020LectureNotes_4_7 - MSE 2020 4/7/2011 Page 1 of 2...

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MSE 2020 4/7/2011 Page 1 of 2 Lorentz Factor (Cont.) o Full width at half max B o = + θ1 θB ∆θ o = - θ2 θB ∆θ o If 1 and 2 are parallel, δ 1’2’ = 0 Ray 1 and ray 2 are out of phase by δ 1’2’ N atoms at spacing ‘a’ each to get I max to drop to 0 intensity = 2Na∆θsinθB λ o Have to be sure we have zero intensity o = ∆θ λ2NasinθB ∆θ 1sinθB , Imax ∆θ∴Imax ∆θ Small θ B , higher intensity; large θ B , lower intensity Breadth of peak can be due to disorder (deviations between planes)
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MSE 2020 4/7/2011 Page 2 of 2 o Measure of how far the crystals are from ideal crystals o Or changes in interplanar distance due to interplanar strain (compression and strain)
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MSE2020LectureNotes_4_7 - MSE 2020 4/7/2011 Page 1 of 2...

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