Abstract
Nanocrystalline materials are polycrystals in which the diameter of the individual crystallites is of the order of a few (typically 5–15) nanometres. Structurally, these materials consist of the following two components with comparable volume fractions: a crystalline component and a grain boundary component. Extended X-ray absorption fine structure studies indicate that the grain boundary component of nanocrystalline materials represents a new solid state structure with random atomic arrangement.
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