Subject : Transmission electron microscopy and inorganic chemistry needs
Speaker: O.I. Lebedev, Laboratoire CRISMAT, CNRS ENSICAEN, Universite Caen Basse Normandie
It is impossible to overestimate the role of XRD and neutron powder diffraction (NPD) as reliable and extremely precise techniques for solving complex structures in inorganic chemistry. However, there are more and more examples of complex structures for which XRD and NPD are unable to find an unambiguous structure solution and explain physical properties, and more input from the nanoscale level of the materials structure (possible superstructure, short range order- disorder effects and possible chemical and structural inhomogeneities) are needed. Indeed, TEM is one of the most powerful and reliable techniques to provide this type of information at an atomic level. Moreover, recent advances in aberration-corrected microscopy allow the acquisition of chemical, structural and even electronic information from single atomic columns. Combining conventional, analytical and advance TEM with XRD and NPD is therefore highly effective in completely solving new structures. The use of different methods of electron microscopy for the needs of inorganic chemistry will be discussed for several examples of new complex materials.
When and where: Friday, March 16, 2012 at 11.30 h in room X.009, Campus Groenenborger