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X-Ray Diffractometer (XRD)

Facility News

PANalytical  X'Pert Pro Powder Diffraction instrument has been upgraded with new fast detector (PIXcel1D), diffracted beam monochromator, and sample changer.  For more information download the XRD Upgrade Notes and updated SOP (see links below).

New Bruker D8 DISCOVER  with Davinci design high resolution X-ray diffraction system has been installed at the Chemistry Department. Both high resolution (HR) and powder diffraction (PD) configurations are available for measurements. HR configuration utilizes 0-D scintillator counter and 1-D position sensitive (LYNXEYE) detectors. The last one allows to provide fast measurements. PD configuration includes unique large area 2-D VANTEC-500 detector. The instrument can be used for different applications: thin films characterization (rocking curves, reciprocal space mapping), crystal orientation, minerals and rocks study (phase identification by microdiffraction), texture measurements (pole figures). Facility location - MR1129

Location and Contact Information

 

Facility Images

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About the facility

This XRD instrument from Panalytical is used primarily for powder diffraction. The X’Pert powder instrument is configured with simple slits and proportional detector for data collection to do phase analysis including Rietveld refinement. The built-in structural database (PDF) allows identification of phases from powder diffraction data.

Features

  • X-ray source: Philips high intensity ceramic sealed tube (3kW)
  • Wavelength: Cu Ka (1.5405 Å)
  • Incident beam optics: Soller slit (0.04 rad), interchangeable divergence fixed slits and masks.
  • Diffracted beam optics: Soller slit (0.04 rad), Ni-filter, interchangeable fixed antiscattering and receiving slits.
  • Detector: sealed proportional counter
  • Sample stage: fixed stage and spinner
  • Software: Data Collector,  HighScore (Plus)

 

Background: X-ray powder diffraction

Powder XRD (X-ray Diffraction) is one of the most widely used x-ray diffraction technique for characterizing materials. The sample is supposed to be in a powdered form (as it follows from the name of the technique) consisting of fine single crystalline grains of material to be studied. The technique is used also for analyzing particles in liquid suspensions or polycrystalline solids (bulk or thin film materials).

The atoms in a crystal are a periodic array of coherent scattering centers and thus can diffract light. Interaction of X-rays with powdered sample creates secondary “diffracted” beams (actually generated in the form of cones) of X-rays related to interplanar d-spacings in the crystalline powder according to Bragg’s Law: nλ = 2d sinθ, where n is an integer, λ is the wavelength of the X-rays, d is the interplanar spacing generating the diffraction, and θ is the diffraction angle.

Powder diffraction data can be collected using either transmission or reflection geometry. Because the particles in the powder sample are randomly oriented, these two methods will yield the same data.

Useful Links

XRD application

X'Pert Pro XRD SOP

PIXcel Upgrade Notes

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