Energy Dispersive X-Ray DiffractionEnergy Dispersive X-Ray Diffraction

Taha SochiTaha Sochi

EDDEDDIn Energy Dispersive Diffraction (EDD) method white X-ray with an energy-discriminating detector fixed at a chosen angle 2 is used.

The EDD detector sorts the diffracted X-ray photons according to their energies and thus generates diffraction pattern.

Advantages & Advantages & DisadvantagesDisadvantagesFixed geometry with no moving parts during data collection (easier design and acquisition).Energetic high-flux white X-ray beam which penetrates through large bulky objects (non-destructive probing and rapid data collection).

Limited count rate of solid state energy-discriminating detector.Relatively low pattern resolution of the data obtained with excessive overlap.Fixed scattering angle which is a compromise.

Signals other than diffraction (fluorescence).

Pixelated DetectorsPixelated DetectorsSome EDD shortcomings may be overcome by the development of the new generation of multi-pixel detectors such as HEXITEC detectors (16X16, 20X20, 80X80).

TEDDITEDDITomographic imaging technique which exploits white beam to gain diffraction information from volume elements within a bulk sample.

Used to image the interiors of objects in terms of both density and compositional variations.

Each volume element visited yields a

diffraction pattern

Related WorkRelated Work

Developing computational techniques for HEXITEC multi-pixel Developing computational techniques for HEXITEC multi-pixel detectors.detectors.

Participation in data collection (Daresbury SRS, Diamond, Participation in data collection (Daresbury SRS, Diamond, ESRF) and experimental work.ESRF) and experimental work.

Developing a high-throughput program 'EasyDD' which is Developing a high-throughput program 'EasyDD' which is originally developed for the Daresbury SRS station 16.4 energy originally developed for the Daresbury SRS station 16.4 energy dispersive (TEDDI) detectors.dispersive (TEDDI) detectors.

Processing and analyzing several large data collections in Processing and analyzing several large data collections in EDD, ADD and CT (presented in thesis).EDD, ADD and CT (presented in thesis).

EDD Data (Phantom Object)EDD Data (Phantom Object)

Real life picture Real life picture of test objectof test object

2D schematic of 2D schematic of test objecttest object

3D schematic 3D schematic of test objectof test object

EDD Data (Acquisition & Processing)EDD Data (Acquisition & Processing)

SinogramSinogram Back-ProjectedBack-Projected

EDD Data (Phase Identification)EDD Data (Phase Identification)

WaxWax

AluminiumAluminium

PEEKPEEK

Bone ashBone ash

Iron oxideIron oxide

GlassGlass

Related PublicationsRelated PublicationsOlivier Lazzari, Simon Jacques, Olivier Lazzari, Simon Jacques, Taha SochiTaha Sochi, Paul Barnes. Reconstructive colour X-ray , Paul Barnes. Reconstructive colour X-ray diffraction imaging – a novel TEDDI imaging method. Analyst, 134(9): 1802-1807, 2009. DOI: diffraction imaging – a novel TEDDI imaging method. Analyst, 134(9): 1802-1807, 2009. DOI: 10.1039/b901726g

M.D. Wilson, P.  Barnes, R.C. Cernik,  C.C.T. Hansson,  S. Jacques, L.L. Jones,  P. Seller, P.J. M.D. Wilson, P.  Barnes, R.C. Cernik,  C.C.T. Hansson,  S. Jacques, L.L. Jones,  P. Seller, P.J. Sellin,  Sellin,  Taha SochiTaha Sochi,  M.C. Veale, P. Veeramani, P.J. Withers, C.P. Youd. Comparison of the X-,  M.C. Veale, P. Veeramani, P.J. Withers, C.P. Youd. Comparison of the X-ray performance of small pixel CdTe and CZT detectors. Nuclear Science Symposium ray performance of small pixel CdTe and CZT detectors. Nuclear Science Symposium Conference Record (NSS/MIC), Issue Date: Oct. 30 2010-Nov. 6, pages 3942-3946, 2010. DOI: Conference Record (NSS/MIC), Issue Date: Oct. 30 2010-Nov. 6, pages 3942-3946, 2010. DOI: 10.1109/NSSMIC.2010.5874554

Taha SochiTaha Sochi. Computational Techniques for Efficient Conversion of Image Files from Area . Computational Techniques for Efficient Conversion of Image Files from Area Detectors. Sensors and Actuators A: Physical, 168(1): 72-76, 2011. DOI: Detectors. Sensors and Actuators A: Physical, 168(1): 72-76, 2011. DOI: 10.1016/j.sna.2011.03.059

R.J. Cernik, C.C.T. Hansson, C.M. Martin, M. Preuss, M. Attallah, A.M. Korsunsky, J.P. R.J. Cernik, C.C.T. Hansson, C.M. Martin, M. Preuss, M. Attallah, A.M. Korsunsky, J.P. Belnoue, T.S. Jun, P. Barnes, S. Jacques, Belnoue, T.S. Jun, P. Barnes, S. Jacques, Taha SochiTaha Sochi, O. Lazzari. A synchrotron tomographic , O. Lazzari. A synchrotron tomographic energy-dispersive diffraction imaging study of the aerospace alloy Ti 6246. Journal of Applied energy-dispersive diffraction imaging study of the aerospace alloy Ti 6246. Journal of Applied Crystallography, 44(1): 150-157, 2011. DOI: Crystallography, 44(1): 150-157, 2011. DOI: 10.1107/S0021889810050077

S.D.M. Jacques, M. Di Michiel, A.M. Beale, S.D.M. Jacques, M. Di Michiel, A.M. Beale, Taha SochiTaha Sochi, M.G. O’Brien, L. Espinosa-Alonso, , M.G. O’Brien, L. Espinosa-Alonso, B.M. Weckhuysen, P. Barnes. Dynamic XRD-CT Reveals Real-time Insight into Catalyst Active B.M. Weckhuysen, P. Barnes. Dynamic XRD-CT Reveals Real-time Insight into Catalyst Active Phase Evolution. Angewandte Chemie (accepted).Phase Evolution. Angewandte Chemie (accepted).

Selected ReferencesSelected References

* Cockcroft J.K., Barnes P., Attfield M., Vickers M. and Jacques S.D.M. (2001) Powder Diffraction on the Web, UCL. URL: http://pd.chem.ucl.ac.uk/pd.

* Barnes P. et al. (2001-b) Tomographic energy-dispersive diffraction imaging of static and dynamic systems. Nondestructive Testing 17: 143-167.

* Clark S.M. (2002) Thirty years of energy-dispersive powder diffraction. Crystallography Reviews 8(2-4): 57-92.

* Helliwell J.R. (1998) Synchrotron radiation and crystallography: the first 50 years. Acta crystallographica Section A 54(6): 738-749.

* Buras B. and Gerward L. (1989) Application of X-ray energy-dispersive diffraction for characterization of materials under high pressure. Progress in Crystal Growth and Characterization 18: 93–138.

Thank you!Thank you!

Questions?Questions?