Diffraction measurements to determine the intensity of Debye-Scherrer reflexes using a cubic powder sample

Продукт No: P2542601

Principle

A polycrystalline, cubic face-centered crystallizing powder sample is irradiated with the radiation from a Roentgen tube with a copper anode. A Geiger-Mueller counter tube is automatically swivelled to detect the radiation that is constructively reflected from the various lattice planes of the crystallites. The Bragg diagram is automatically recorded. The intensities of the individual reflex lines are determined and compared with those theoretically expected. In addition, the evaluation allows the Bragg reflexes to be assigned to the individual lattice planes, and both their spacing and the corresponding Bravais lattice type to be determined.

Tasks

  1. Record the intensity of the Cu X-rays back scattered by a cubic crystallizing copper powder sample as a function of the scattering angle.
  2. Calculate the lattice plane spacings from the angle positions of the individual Bragg lines.
  3. Assign the Bragg reflexes to the respective lattice planes. Calculate the lattice constant of the substance and the Bravais lattice type.
  4. Determine the intensity of the individual reflex lines and compare them with the theoretically expected intensities.
  5. 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
  • Lorentz-polarization factor
  • Multiplicity factor
  • Debye-Waller factor
  • Absorption factor
  • Bragg scattering
  • Characteristic X-rays
  • Monochromatization of X-rays



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
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
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
Copper, powder 100 g 30119-10 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

Назад к перечню

Продукт No: P2542601

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