Procedure and Tasks
The Laue Diffraction for Graphite
- Start with a voltage of 10 kV an modest intensity
- Focus the electron beam onto an undamaged position of the graphite
- Copy the (hexagonal) diffraction dots onto a transparent sheet
- Repeat the experiment for the voltages of 6 kV and 8 kV
- Verify the DeBroghli relation between
l and the voltage V
Draw the reciprocal lattice plane perpendicular to the bean direction
Derive the atomic distance in the hexagonal plane of graphite
The Debye-Scherrer Diffraction for Aluminum
- Perform the experiment for the voltages of 6 kV, 8 kV and 10 kV
- Focus the electron beam onto an undamaged position of the Al
- Measure the radii of the diffraction rings for each voltage
- Verify the DeBroghli relation between
l and the voltage V
Which points in the reciprocal lattice contribute to the rings?
Determine the size of the unit cell and the atomic distance.
Comment on the lattice structure.