The Röntgen Radiation and its application in studies of ... - Mansic

In order to improve parallelism of the primary beam is application of the Göbel
mirrors (or Parallel Beam) – these capture in a large solid angle, the X radiations
from the source and produce an intense parallel beam without the Kβ radiations
(Figure 13).
Parallel beam diffractometers have became more common in the use, in the
recent years and have captured some applications from traditional Bragg-
Brentano diffractometers (in thin films measurements and reflectometry).
Multilayer parabolic mirrors proved their efficiency as they collimate incident
beams and are used in a variety of applications [10].
Figure 13. Beam forming by use of the Göbel mirror
Figure 14. Comparison Bragg-Brentano Geometry versus Parallel Beam Geometry
The results are obtained in the form of X-ray diffraction pattern, which shows
dependence of collected intensity versus scattering angle θ (Figure 15).
For the computation of the data different existing programs are being used (such
as the TOPAZ software for the DIFFRAC plus ). Figure 16 shows an example of the
qualitative phase analysis supported by computer phase filtering. Also X-ray diffraction
pattern can be collected versus change of some external parameter applied to
the sample such as temperature, pressure, magnetic or electric field ect. Figure
17 reveals set for X-ray diffraction patterns collected versus temperature change.
Physics of Advanced Materials Winter School 2008 12