Diffuse Scattering - Spallation Neutron Source - Oak Ridge National ...

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$Powder Diffraction - Spallation Neutron Source$

$Single Crystal Diffraction - Spallation Neutron Source$

Small irradiated volumes simplify handling/preparation • Activity ~volume (10 -5 ) • Much less waste (10 -7 ) • Polycrystalline samples easier obtain- closer to real materials Traditional diffuse sample~300 mm 3 Microsample ~10 -3 mm 3 100-1000 samples
<strong>Diffuse</strong> microdiffraction holds promise for irradiated materials • Powerful single crystal techniques applied to polycrystals • ~4-6 Orders of magnitude lower activity – Safer/lower backgrounds • Cryocooled samples to study initial defects • New information about point/line/mesoscale defect interactions Successful demonstration experiments! counts (electron units) 10 7 10 6 10 5 10 4 10 3 10 2 10 1 counts ~ q -4 counts ~ q -2 Unirradiated, (044) Irradiated (044) Irradiated, (033) Polycrystalline Fe, 77 K 0.01 0.1 |q| (reciprocal lattice units)
Page 1 and 2: Diffuse Scattering • Anticipatory
Page 3 and 4: Presentation concentrates year grad
Page 5 and 6: What you already know- arrangement
Page 7 and 8: If crystal lattice of atoms leads t
Page 9 and 10: You already know length scales are
Page 11 and 12: Who the heck was Krivoglaz? • Bri
Page 13 and 14: Single crystals and surfaces -trunc
Page 15 and 16: A little math helps for party conve
Page 17 and 18: X-rays scattering measurements infe
Page 19 and 20: Extra diffuse scattering often obse
Page 21 and 22: Complete transformation induced by
Page 23 and 24: Neutrons uniquely sensitive to low
Page 25 and 26: Alloys can have another type 1 defe
Page 27 and 28: Neutron/ X-rays Complimentary For S
Page 29 and 30: X-ray anomalous scattering can chan
Page 31 and 32: Measurement and theory of atomic si
Page 33 and 34: High-energy x-ray measurements revo
Page 35 and 36: Dislocations -Krivoglaz defect of t
Page 37: Intense microbeams/area detectors p
Page 41 and 42: Numerical calculations determine qu
Page 43 and 44: X-ray Diffuse Scattering Huang theo
Page 45 and 46: Corelli SNS beamline specialized fo
Page 47 and 48: New directions in diffuse scatterin
Page 49 and 50: A. Gunier Diffuse scattering done b

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