2D atomic mapping of oxidation states in transition metal oxides by scanning transmission electron microscopy and electron energy-loss spectroscopy

Using a combination of HAADF-STEM imaging and atomically resolved EELS in an aberration-corrected TEM we demonstrate the possibility of 2D atom by atom valence mapping in the mixed valence compound . The ELNES from and cation sites are similar to those of and references. Comparison with simulations shows that even though a local interpretation...

Characterization of Low-dimensional Structures by Advanced Transmission Electron Microscopy

This thesis describes method development in TEM-related techniques and their application to the study of nanoprecipitates and low-dimensional structures. The work is divided into two parts. • The first part is focused on the structures of nanoprecipitates found in Al-Co, Al-Ni and Al-Fe-Zr alloys. • The second part describes the effect of...