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Direct Observation of Chemical Pressure in Intermetallic Alloys by Scanning Transmission Electron Microscopy

As solute atoms are added to intermetallic compounds, local chemically induced pressure develops and results in atomic displacements. These distortions play a critical role in defining the mechanical behavior of these materials, for example, by impeding dislocation motion. While indirect methods, such as diffraction determined pair distribution functions, can access the average structure, spatially resolved information is lost. Scanning transmission electron microscopy (STEM), on the other hand, possess excellent spatial resolution, but image distortions often limit the ability to accurately and precisely measure projected crystal structure.