Abstract
Nanocrystalline materials are single- or multiphase polycrystals with a crystallite size in the range of a few nm (typically 5–20 nm), so that about 30 vol.% of the material consists of grain- or interphase boundaries. Characteristic structural features are a reduced atomic density and random atomic arrangement in the grain boundary component. EXAFS studies on bismuth doped nanocrystalline copper show that bismuth segregates in the grain boundaries exhibiting a low coordination of Cu atoms as neighbours. Bi doping causes structural rearrangements in the grain boundaries, in comparison to grain boundaries in undoped nanocrystalline copper, due to a reduction of the free volume in the grain boundaries.
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