Debye-Scherrer diffractions pattern of powder samples with a diamond structure (according to Bragg-Brentano)

Продукт No: P2542201
Principle

Polycrystalline powder samples, which crystallize in the three cubic Bravais types, simple, face-centered and body-centered, are irradiated with the radiation from a Roentgen tube with a copper anode. A swivelling Geiger-Mueller counter tube detects the radiation that is constructively reflected from the various lattice planes of the crystallites. The Bragg diagrams are automatically recorded. Their evaluation gives the assignment of the Bragg lines to the individual lattice planes, their spacings as well as the lattice constants of the samples, and so also the corresponding Bravais lattice type.

Tasks

  1. Record the intensity of the Cu X-rays back scattered by the four cubic crystal powder samples with various Bravais lattice types as a function of the scattering angle.
  2. Calculate the lattice plane spacings appropriate to the angular positions of the individual Bragg lines.
  3. Assign the Bragg reflections to the respective lattice planes. Determine the lattice constants of the samples and their Bravais lattice types.
  4. Determine the number of atoms in the unit cell.

What you can learn about

  • Crystal lattices
  • Crystal systems
  • Bravais-lattice
  • Reciprocal lattice
  • Miller indices
  • Structure factor
  • Atomic scattering factor
  • Bragg scattering
  • Characteristic X-rays
  • Monochromatization of X-rays
  • Bragg Brentano geometry



Перечень материалов (вы́писка) Продукт Количество
XR 4.0 expert unit, X-ray unit, 35 kV 09057-99 1
XR 4.0 X-ray Plug-in Cu tube 09057-51 1
XR 4.0 X-ray goniometer 09057-10 1
XR 4.0 Software measure X-ray 14414-61 1
Germanium, Powder, 99%, 10 g 31768-03 1
Geiger-Mueller counter tube, type B, BNC cable 50 cm 09005-00 1
XR 4.0 X-ray LiF crystal, mounted 09056-05 1
XR 4.0 X-ray Universal crystal holder for X-ray unit 09058-02 1
XR 4.0 X-ray Diaphragm tube w. nickel foil 09056-03 1
XR 4.0 X-ray Diaphragm tube d = 2 mm 09057-02 1
Silicium, finest powder, 50 g 31155-05 1
XR 4.0 X-ray sample holder for powder samples (diffractometry) 09058-09 1
Data cable USB, plug type A/B, 1.8 m 14608-00 1
Mortar w. pestle, 70ml, porcelain 32603-00 1
Vaseline 100 g 30238-10 1
Microspoon, steel 33393-00 1

Литература по данной статье

Название Продукт Язык
Handbuch Lehrerversuche mit Röntgenstrahlung für die XR 4.0 expert unit, TESS expert Physik 01200-01 DEU
TESS expert Physics Handbook X-ray Experiments for XR 4.0 expert unit 01200-02 ENG
XRS 4.0 X-ray Strukturanalyse Erweiterungsset 09140-88

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Продукт No: P2542201

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