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Published byRonan Holly Modified over 3 years ago

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Sai Nandyala

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Determination of crystal structure internally Every lattice plane behaves like a diffraction grating when X-rayed Position of spectral likes depend on distance between lines and so the nature of X-ray depends on the spacing between planes

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(pic 5.1) Monochromatic xrays FCD, FC’D, FC’’D are path lengths FC’D is larger than FCD by AC’B AC’B = 2AC = 2dsin# N(lamda) = 2dsin# Bragg’s Equation N-integral number lamda – wavelength (Eq of f) F = sf = mean amp. Of waves scattered W(r) = prob. Of finding e- bw two shells

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Laue Photographic Method Rotating Crystal Method Oscillating Crystal Method Powder Method

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Tiny crystal on narrow incident beam from filament to diff beam on p plate Laue pattern appears #, d(spacing), is found (pic)

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Beam penetrates at 90” where crystal rotates on axis // to axes During rotation, diff positions show diff spots on p plate (pic) Terms of layer lines

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Crystal at 10” to 20” Reflecting positions exposed and is lim. Cylindrical p plate

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Powdered samples Beam to powder to diff ray to strip to diff rings Simplest to work Work when crystals uneasy to get (pic)

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Identify crystaline phases and orientations Determine atomic arrangement Measure thickness of films Determine structural properties

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X-RAY METHODS FOR ORIENTING CRYSTALS

X-RAY METHODS FOR ORIENTING CRYSTALS

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