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Abstract
Nanocrystalline metals prepared by evaporation or sputtering with crytallite condensation and compaction were studied by means of positron lifetime spectroscopy in order to obtain information on structural free volumes in the crystallite interfaces. In a number of bcc- and fcc-type nanocrystalline metals two dominant positron lifetime components were observed, which are attributed to positron trapping and annihilation in interfacial free volumes of the mean size of about one lattice vacancy or of about 10 – 15 lattice vacancies, and which are considered to represent two maxima of a size distribution of free volumes. Positron lifetime measurements on nanocrystalline Pd under quasi-hydrostatic pressure up to 4 GPa indicate a high compressibility of the vacancy-type structural free volumes and, therefore, support the evidence for a soft interfacial structure as derived from previous studies of mechanical and thermal properties.
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