Abstract
Abstract The thermal diffusivity of nanostructured Ag, synthesized by inert-gas condensation and in situ compaction, was measured at room temperature by photoacoustic technique. The results indicated that the thermal diffusivity of nanostructured Ag decreased catastrophically as compared to that of conventional polycrystalline Ag and ranged from about 27 to 74% that of polycrystalline Ag for all the nanostructured Ag specimens investigated. Annealing experiments showed that although the thermal diffusivity of nano-structured Ag is related to its grain size, it is dependent strongly on annealing temperature. In addition, it was found that the variation of thermal diffusivity became weak as its relative density reached 93%, below which it decreased steeply with decrease of specimen density. Preliminary analysis showed that the decrease of thermal diffusivity originates mainly from its thermal conductivity, which can be understood in terms of intense electron scattering within interfacial component.
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