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Substitutional tungsten doping of VO2 thin films and its effect on the metal-to-insulator transition are investigated by Cs-corrected scanning transmission electron microscopy (STEM), and ab initio simulations. The W0.02V0.98O2 thin films deposited on (001) sapphire are studied in both planar and transverse geometries. The tungsten atoms are distinguishable from the V atoms in the Z-sensitive high...
Metallic Bi nanoprecipitates (NPs) were observed at grain boundaries (GBs) in a series of Bi-doped Sr 1−x Ba x TiO 3 ceramics sintered at low temperature, using analytical electron microscopy. Most GBs fell into two groups, according to their local structure and chemistry, one with the NPs and the other with titania-based amorphous film. The solution of Ba into the lattice...
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