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Positron lifetimes in nanocrystalline niobium were measured over the grain size range from 35nm down to 5nm. Two lifetimes were obtained indicating distinct annihilation sites at the grain surfaces and in the intercrystalline region. X-ray diffraction studies had indicated a bcc to fcc transformation and a concomitant lattice expansion. Positron lifetimes drastically varied below a grain size of 10nm,...
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