EMS162_2010_XRD_Part3

EMS162_2010_XRD_Part3 - 23 Yayoi Takamura Powder...

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1 2/9/2010 EMS 162 - Winter 2010 16 Yayoi Takamura Structure Factor for BCC • Reciprocal lattice cell: – Double sized unit cell with FCC arrangement 2/9/2010 EMS 162 - Winter 2010 17 Yayoi Takamura Structure Factor for FCC • Reciprocal lattice cell: – Double sized unit cell with BCC arrangement
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2 2/9/2010 EMS 162 - Winter 2010 18 Yayoi Takamura Laue Method • First diffraction method used • Uses: Orienting single crystals 2/9/2010 EMS 162 - Winter 2010 19 Yayoi Takamura Laue Diffraction – Back Reflection X-ray beam tan(180º-2 θ ) = r/X
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3 2/9/2010 EMS 162 - Winter 2010 20 Yayoi Takamura Laue Diffraction - Transmission X-ray beam Sample Film X θ r Direct beam D i f r a c t e d b m tan(2 θ ) = r/X θ 2 θ 2/9/2010 EMS 162 - Winter 2010 21 Yayoi Takamura Laue Diffraction Sample Problem What is the wavelength of radiation diffracted from (-3 -1 0) planes? Where will the (-3 -1 0) reflection strike the film? X-ray beam [001] Film 5.00 cm [ ] 0 1 0 [100]
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4 2/9/2010 EMS 162 - Winter 2010 22 Yayoi Takamura Powder Diffraction 2/9/2010 EMS 162 - Winter 2010
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Unformatted text preview: 23 Yayoi Takamura Powder Diffraction 5 2/9/2010 EMS 162 - Winter 2010 24 Yayoi Takamura Powder Diffraction Patterns 2D detector 1D detector 2/9/2010 EMS 162 - Winter 2010 25 Yayoi Takamura Typical Diffraction Spectra 20 30 40 50 60 1000 2000 3000 4000 5000 6000 Intensity [a.u.] 2 theta (degrees) 6 2/9/2010 EMS 162 - Winter 2010 26 Yayoi Takamura Powder Diffraction k k k-k k k k-k k k k-k 2/9/2010 EMS 162 - Winter 2010 27 Yayoi Takamura Powder Diffraction k k k-k k k k-k 7 2/9/2010 EMS 162 - Winter 2010 28 Yayoi Takamura Hull/Debye Scherrer Camera 2/9/2010 EMS 162 - Winter 2010 29 Yayoi Takamura Theta-theta geometry Sample - stationary Source Detector 2-Circle Goniometer 8 2/9/2010 EMS 162 - Winter 2010 30 Yayoi Takamura Theta-2theta geometry Sample Source - stationary Detector 2-Circle Goniometer 2...
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EMS162_2010_XRD_Part3 - 23 Yayoi Takamura Powder...

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