Syllabus
1. Accuracy in diffraction experiment - instrumental aberrations, microstructural parameters, geometrical factors, sample transparency, absorption of x-rays, surface roughness, primary and secondary extinction, preferred orientation of crystallites
2. Dynamical effects in crystals.Thermal vibrations, diffusion, chemical inhomogeneity
3. Short and long range ordering - diffractional study of local arrangement at phase transition, x-ray diffraction on structures with large periodicity (multilayers, superconductors) high and low angle diffraction, reflectivity (optical theory, DBWA)
4. Experimental methods of determining the short range orderining - EXAFS, diffuse scattering
5. Computional methods in applied structural analysis - simulating of diffraction pattern (Lazy Pulverix), refinement of real crystal structure (the Rietveld method), deconvolution. Determinination of thin film, multilayer and superconductor structure parameters (SUPREX)
Annotation
This lecture is intended to diploma and PhD students specialised in the X-ray diffraction. The lecture is an extension of lectures FPL012 (Structure of matter and diffraction of radiation) and FPL030 (Diffraction methods).
It covers the following topics: (a) treatment of instrumental phenomena in X-ray diffraction, (b) study of temperature atomic vibrations, (c) study of chemical inhomogeneities and diffusion processes, (d) diffraction on thin films, (e) diffraction on low -dimensionally periodic structures (multilayers, quantum dots) and (e) some computational methods in structure analysis. The complete course on advanced methods in X-ray diffraction consists of two lectures: FPL029 (X-ray diffraction study of the real structure of matter) and FPL040.