X-ray Powder Diffraction Laboratory (XRPD-lab)

Head of the Laboratory: Dr. Davide Levy, Ph.D.  Office: +972-3-640-7815. Email: davide@tauex.tau.ac.il
 

X-ray

The X-ray diffraction is the main technique to study the crystalline matter at different level: from finding the phases in an unknown powder to a fine description of the atomic structure of a material. This technique is very versatile because can applied on different field of physics chemistry, biology and material science.

The X-ray Powder Diffraction laboratory is equipped with a Bruker D8 DISCOVER diffractometer.


The main features of this instrument are:

  • source: Cu or Cr X-ray tube with fix anode
  • goniometer radius: 430 mm
  • beam type: divergent beam (Bragg-Bentano geometry), linear parallel beam (Goebel mirror), round parallel beam (polycapillary)
  • Eulerian cradle: x, y, z, Psi, Phi motion
  • sample holder: flat plate, wafer chuck, zero background sample holder, rotating capillary, in-vacuum sample holder
  • detector: point detector, linear detector LYNXEYE XE

The instrument is very flexible and can work on different type of solid materials and sample:

  • inorganics
  • organics
  • small bioorganic structure (aminoacid and peptides)
  • powder
  • poly-crystalline
  • thin film
  • minerals
  • asbestos
  • industrial materials
  • drugs
  • battery materials

The laboratory service usually gives a full data analysis to obtain the main information:

  • phase determination and quantification
  • cell parameter calculation
  • grain size determination
  • amorphous phase quantification
  • Structure determination of organic and  biorganic molecules.
  • Micro-diffraction (500/300 μm) 

Software and database:

  • Diffrac.eva 2019 (phase determination)
  • Topas 5 (Peak analyis, Cell determination, Rietvled, leBail and Pawley method)
  • GSAS-II (Peak analyis, Cell determination, Rietvled, leBail and Pawley method)
  • EXPO 2014 (structure determination: direct methods and simulated anealing) 
  • Crystal Maker (structure vizualization and diffraction simulation) 
  • PDF-4+ database for inorganic materials (updated version) 
  • PDF-4+ ORGANICS database for iorganic materials (updated version) 
  • The Cambridge Crystallographic Data Base for organic molecules (updateD version)
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