From Atomic-Scale Ordering to Materials Properties: Aberration-Corrected STEM, Spectroscopy, and Simulation
Understanding structure-property relationships is at the heart of materials science and engineering. The ability to characterize how atomic-scale structure and composition affect macro-scale properties allows new materials to be engineered more effectively and efficiently. From traditional metallic systems where microstructure dictates mechanical behavior to functional oxide thin films where ordering strongly affects magnetic properties, aberration corrected scanning transmission electron microscopy (STEM), spectroscopy, and simulation can greatly improve our capabilities.
In this lecture I will discuss how we are pushing the limits of analytical techniques such as X-ray energy-dispersive spectroscopy (XEDS) and electron energy-loss spectroscopy (EELS) in the STEM to determine composition and bonding on the atomic scale. Using examples from our recent work on Ni-based superalloys, complex double perovskite materials for spintronics and organic materials for photovoltaic applications, I will discuss how our data is providing new insights into structure-property relationships. I will also discuss the importance of image and spectral simulation to avoid potentially misleading interpretation of “atomically-resolved” compositional maps.
About the speaker
Professor David McComb
Professor & Ohio Research Scholar, Materials Science and Engineering
Director, Center for Electron Microscopy and Analysis
The Ohio State University, USA
Professor David William McComb is an Ohio Research Scholar, Professor of Materials Science and Engineering, and Director of the Center for Electron Microscopy and Analysis (CEMAS) at The Ohio State University. Prof. McComb is an expert in the development and application of electron energy-loss spectroscopy (EELS) as a sub-nanometre scale probe of chemistry, structure and bonding. He has extensive experience in the application of EELS to the study of problems in solid-state chemistry and materials science including structural and compositional variations in high-k oxides, short range magnetic order in transition metal oxides, interfaces in fuel cells, photovoltaics, multiferroics and biomaterials. He is a fellow of the Royal Society of Chemistry and the Institute of Materials, Minerals and Mining. Before joining The Ohio State University, Prof. McComb was a Professor of Nanomaterials at Imperial College London and the co-Director of the London Centre for Nanotechnology. Prof. McComb has published over 200 articles in the scientific literature and has delivered numerous invited lectures around the world.