Abstract
The structure of multiply-twinned palladium particles (size in the range 5–20 nm) grown onto evaporated MgO substrates was examined using axial illumination lattice imaging with a high resolution electron microscope. Results from observation of icosahedral and decahedral lattice plane images and from optical diffractograms confirm that the particle structure is arranged with fcc twin related tetrahedral segments having a fivefold symmetry axis. No evidence was found for the presence of a small gap or defects along the twin boundaries.
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