Visualization of 3D Diffraction: MAX3D
Transcript of Visualization of 3D Diffraction: MAX3D
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Visualization of 3D Diffraction:MAX3D
Jim Britten, Weiguang Guan, Vicky Jarvis
McMaster University, Hamilton, ON, Canada
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Abstract
MAX3D is a program for the visualization of 3Ddiffraction data. This includes everything seen by thearea detector – not just harvested Bragg spots. The inputmay be transmission data from a single crystal, reflectiondata from a textured solid, or diffraction from a thinnanoparticle film on a substrate. Tools have beendeveloped for probing, imaging and exporting selectedareas of reciprocal space in terms of 2Theta or HKL. Ithelps you understand your sample, recognize diffusescattering and troubleshoot difficult problems. It is apowerful tool for generating teaching materials from realsamples. MAX3D is available at no charge for Academicresearchers.
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Quick X-ray Review
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From Pecharsky & Zavalij
Reciprocal Space
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SCD - 2D image + scan –> 3D Int vs 2θXRD2 - 2D image –> 1D Int vs 2θ
From Bob He’s book: Two-Dimensional X-Ray Diffraction
nλ=2d(sinθ)
Single Crystal
Powder or polycrystalline solid
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Visualisation of 1D Reciprocal Space
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CdTea=6.4827F-43m
ZnTea=6.1034F-43m
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Rotate the sample in the beam and collect 2D frames.
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The 2D images can be mapped into reciprocal space – onto the surface of Ewald’s Sphere
From Pecharsky and Zavalij
Detector
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Single Crystal Structure Determination
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Rotate 200µm crystal in X-ray beam
Every 0.5° store CCD image of diffraction.
Identify unit cell and Space Group
Collect full diffraction pattern
Phase and Fourier Transform to see structure
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Al70Pd21Mn9 - Geetha Balakrishnan, University of Warwick
Nathan Armstrong, Tom Timusk, McMaster
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Visualisation of 3D Reciprocal SpaceQuasicrystal
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Diffuse Scattering
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Hexanapthylbenzene. Laura Harrington, Mike McGlincheyCPDW13 CLS 9
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Diffuse Scattering
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Hexanapthylbenzene. Laura Harrington, Mike McGlincheyCPDW13 CLS 10
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GdPb2Cu3Se4 1200ᵒC for 4 hrs (Plates)XRD pattern from Panalytical X’Pert Pro
Diffractometer, Cu Kα1 - Forbes, Mozharivskyj
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Canadian Macromolecular Crystallography Facility, 08B1-1 (CMCF-BM) Beamline
GdPb2Cu3Se4
Phone a friend –Pawel Grochulski. Look at a single grain of the powder on a protein beamline.
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Protein SC Diffraction Pattern
Alba GuarneTamiza Nanji
Rigaku R-Axis4++Image Plate
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Follow Phase Changes
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Zheng, Preston, McMaster U
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Residual Stress – Sampling 3D RS
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(Image from Bob He’s book)
Looking for subtle changes in 2θposition of line/arc/shell to indicate orientation dependent residual stresses. Hard to see visually – need mathematical analysis.
High angle snapshots of diffraction shell segments in four series of φsteps at different ψ tilt angles. Looking for elliptical deviation from spheres where r = 1/d0
220Ferrite
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From Bob He’s book: Two-Dimensional X-Ray Diffraction
nλ=2d(sinθ)
Single Crystal
Powder or polycrystalline solid
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SCD - 2D image + scan –> 3D Int vs 2θXRD3 - 2D image + scan –> 3D Int vs 2θ
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A ‘pole’ is a unit vector along a diffraction vector representing one grain. For a random powder the number of poles is normalized to 1. Textured samples show a variation in normalized pole density with orientation.
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From Bob He
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Mo diffraction from surface of tab of an Aluminum weighing dish
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Mo diffraction from Al foil (ALCAN)
φ-scan, 2θ=-40, ω=168, χ=54.74, 2s φ-scan, 2θ=-40, ω=175, χ=54.74, 2s
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Mo diffraction from Al foil (ALCAN)
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1 1 1
2 0 0
2 2 03 1 1
XRD3 of Al foil showing rolling texture
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Pole figures from Al foil on Mo CCD
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111
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Rolling Direction
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Al Foil Pole Figures calculated from ODF (MTEX in Matlab)
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. . . from GADDS User Guide
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Texture Example: Au nanoparticle film grown on MgAl2O4 substrate
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200 nm
Majdi, Preston, McMaster U
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Pole Figures from Au filmStereographic projections of individual 2θ hemispheres
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Recent Modifications to MAX3D
• Update VTK and QT libraries
• Merge frame readers into a Unified Reader
• 3D shells of Δ2θ thickness for pole figures
• 3D Clipping
• 2D and 1D projection output
• 3D pointer to identify diffraction features in terms of (fractional) hkl
• Linux version
• Supercomputer cluster version
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Mn5Ni6Si4 ; Marek Niewczas, Sheikh Ahmed
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Mn5Ni6Si4 ; Marek Niewczas, Sheikh Ahmed
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3D Clipping, Reloading at Higher Res
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2D and 1D Projections of the VOI
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Example: 2D Projection Output
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Slice View
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HK0 > HK8
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Electron Diffraction of Mn5Ni6Si4
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Current MAX3D project
• Reader for 3D Electron Diffraction Data• EMPAD detector
• Jo Etheridge, Monash University
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Funding Acknowledgements
• SHARCNet Dedicated Programming Awards • Ranil Sonnadara
• Mark Hollingsworth, KSU
• Joe Ferrara, Rigaku
• Thank You• . . . and for the tutorial . . .
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InAsSb Pillars for Multispectral Long-wavelength Infrared AbsorptionCurtis J. Goosney, Victoria M. Jarvis, James F. Britten, Ray R. LaPierre
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311 Pole Figure
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