Abstract
Nanostructured materials are single-phase or multiphase polycrystals with a crystallite size of the order of a few nanometers (typically 5–10 nm). Due to the small crystallite size, about 30 vol% of the material consists of grain boundaries. Scanning tunneling microscopy has been applied to characterize the microstructure of nanostructured Pd which was prepared by consolidating nanometer-sized crystallites of Pd. The crystallites were produced by the inert gas condensation method. The nanocrystalline Pd was found to consist of small crystallites separated by grain boundaries. The average crystal size was about 10 nm. During the scanning process in the tunneling microscope, the specimen structure changed. This change led to the alignment of the grains at the surface of the sample, indicating a high mobility of the crystallites in nanostructured palladium far below the melting point.
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