Beschreibung:
Almost 50 years have passed since the famous papers of Hugo Rietveld from the late sixties where he describes a method for the refinement of crystal structures from neutron powder diffraction data. Soon after, the potential of the method for laboratory X-ray powder diffraction was discovered. Although the method is now widely accepted, there are still many pitfalls in the theoretical understanding and in practical daily use.
- Basics of powder diffraction- The Rietveld formula
- Whole Powder Pattern Fitting (Pawley, LeBail, Rietveld)
- Concept of Convolution
- Deriving the instrumental resolution function
- Global versus local optimization
- Structure determination
- Fourier analysis
- Isotropic and anisotropic microstructural properties
- Rigid bodies, constraints, restraints
- Sequential versus parametric Rietveld refinement
- Symmetry and rotational modes
- Modelling stacking faults
- Quantitative phase analysis
- Determination of amorphous content
- Agreement factors
- Macro programming