Module catalogue

Crystallised Solids, structures and symmetry

2M1AB1	Crystallised Solids, structures and symmetry				Materials and Chemistry				S8
Lessons : 14 h		TD : 14 h		TP : 20 h		Project : 0 h		Total : 48 h
Co-ordinator : Sylvie Malo

Prerequisite
First year course of crystallo-chemistry
Course Objectives
Introduction to the structural analysis of materials. Determination of the coordination polyhedra and sequence of these polyhedra. Understanding and knowledge of the parameters involved in the determination of structures by diffraction techniques: X-rays, electrons, neutrons.
Syllabus
- Classification of crystalline structures. - point groups and symmetry classes: + Symmetry operators + Combination of operators. - Space groups + Translation groups + Operators including translation (glide planes, screw axes). - The 32 symmetry classes - The reciprocal space: case of simple and multiple cells. Ewald's construction: application to X-rays, electrons and neutrons.
Practical work (TD or TP)
the lab classes comprise three parts : - structural studies : coordination polyhedra, symmetries and space groups - structural resolution from powder data diffraction (determination of cell parameters and atomic positions) - electron diffraction : study of electron diffraction patterns
Acquired skills
Basic principles required for structural determication from powder diffraction data. Structure calculation on simple models. Basic principles of electronic diffraction.
Bibliography
- M. Van Meersche, J. Fencau-Dupont: "Introduction à la cristallograhie et à la chimie structurale", ed. Peeters. - A.E. Wells, "Structural inorganic chemistry", ed. Oxford Sciences Publications