972 B3102005 Diffraction Direction

1. Diffraction: directions of diffraction <ul><li>For a set of plane (hkl), an incident x-ray </li></ul><ul><li>beam with wavelength…
of 19
All materials on our website are shared by users. If you have any questions about copyright issues, please report us to resolve them. We are always happy to assist you.
Related Documents
  • 1. Diffraction: directions of diffraction <ul><li>For a set of plane (hkl), an incident x-ray </li></ul><ul><li>beam with wavelength  will be diffracted when </li></ul><ul><li>incident, diffracted and plane normal are coplanar </li></ul><ul><li>incident and diffracted beams both make a Bragg angle  B with the (hkl) plane, where  =2d sin  B </li></ul><ul><li>Provided the structure factor for (hkl) plane F(hkl) is not zero </li></ul>
  • 4. Summation over all atoms in a unit cell with positions [x n , y n , z n ] and atomic scattering factor f n (to be defined later).
  • 5. Difference between powder and single crystal diffraction <ul><li>For a single crystal sample, the whole sample is a large, continuous crystal </li></ul><ul><li>A powder sample is an assembly of randomly or partial randomly oriented tiny crystals called grains, it may be in a form of true powder or a piece of solid bulk. </li></ul><ul><li>For single crystal diffraction, both background and characteristic radiations from an x-ray tube are diffracted. </li></ul><ul><li>In powder diffraction, only characteristic radiations are considered because diffraction of weak background radiations by small grains is usually negligibly weak. </li></ul>
  • 6. Single crystal diffraction-Laue method
  • 7. Laue camera
  • 9. (a) Transmission (b) back-reflection Laue W radiation, 30kV, 19mA
  • 10. Powder diffraction
  • 11. Powder diffraction: poles of plane normals for (hkl) planes of all grains distribute uniformly on the surface of the reference sphere
  • 13. Powder diffraction-Pinhole camera
  • 14. Powder diffraction-Hull/Debye-Scherrer camera
  • 15. Powder diffraction-Hull/Debye-Scherrer camera
  • 19. Homework assignment <ul><li>Cullity 3-1 </li></ul><ul><li>Cullity 3-3 </li></ul>
  • We Need Your Support
    Thank you for visiting our website and your interest in our free products and services. We are nonprofit website to share and download documents. To the running of this website, we need your help to support us.

    Thanks to everyone for your continued support.

    No, Thanks