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Muon diffusion in intermetallic compounds of the MoSi2-type structure
Authors: P. J. Mendes, L. P. Ferreira, J. M. Gil, N. Ayres de Campos
Ref.: J. Phys. Condens. Matter 13, 5285-5293 (2001)
Abstract: The localization and diffusion of positive muons are studied in three binary metallic systems, Zr2Cu, Hf2Cu and Ti2Cu, presenting the MoSi2-type structure. Zero-held mu SR measurements are interpreted as the muons being static in the T-b/O-b interstitial site at low temperatures and, as the temperature is increased, starting diffusing through the network of Tb sites around the Ob site, until they reach a state occupying simultaneously the four Tb sites. Long-range diffusion is observed above 300 K. Activation energies for the lower-temperature diffusion processes are obtained. The results are interpreted in terms of the lattice structure characteristics.
