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MEMS1054_week4_6v3shorter-crystaldiffraction1

# MEMS1054_week4_6v3shorter-crystaldiffraction1 - MEMS 1054...

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MEMS 1054 Materials Science 1 or Structure of Crystals and Diffraction Week 4-6 - Diffraction 1 Professor Jörg Wiezorek, PhD, Materials Science and Metallurgy, University of Cambridge, UK, 1994. Meets in room G37 BEH, Mon/Wed/Fri, 1-1:50PM Week 4-6

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A) Crystal Structure Studies by X-ray Diffraction; What are X-rays? How do we make X-rays? What does an emission spectrum from a typical X-ray tube look like? How do X-rays interact with atoms in crystals? Paradigms of Diffraction from Crystals B) Geometry of Diffraction from Crystals: The Bragg Law (Equation), a.k.a ‘The Geometrically necessary condition for diffraction from a crystal’; Examine the Bragg equation and idealized diffraction patterns; X-ray diffraction patterns from Single Crystals, textured polycrystals, Powder (random texture); C) Diffracted Intensities: The Structure Factor illustrations and shorter summary of essentials at… http://www.doitpoms.ac.uk/tlplib/xray-diffraction/intro.php 0) Reciprocal Lattice / Reciprocal Space Lattice / Space Lattice
Scales and Wavelengths X-rays are photons of the electromagnetic radiation spectrum with short wavelength!

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Resolution limit … since |sin Θ | 1, we find that d λ /2
Try the Uplink Here I present to you a useful hyperlink for the exploration of concepts related to basic ideas regarding X-rays, Reciprocal Space Lattices and their relation to diffraction from Crystals; have a look and work on the control questions – http://www.doitpoms.ac.uk/tlplib/index.php http://www.doitpoms.ac.uk/tlplib/xray-diffraction/intro.php What Are X-rays? How do we generate monochromatic X-rays for diffraction from crystals? What are the implications of Bragg’s Law on i)

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MEMS1054_week4_6v3shorter-crystaldiffraction1 - MEMS 1054...

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