The lattice-site occupation of Li, at temperatures of between 40 and 500K, was investigated by using emission channelling methods. Low doses of radioactive 8Li ions were implanted into single crystals. The channelling patterns of -particles that were emitted by the nuclear decay of 8Li were measured and were compared with calculated emission channelling and blocking effects. At temperatures below 130K, the Li ions occupied mainly tetrahedral interstitial sites, and some 10% occupied substitutional sites. At temperatures ranging from 130 to 190K, a site change from tetrahedral interstitial to substitutional was observed. At temperatures of between 190 and 470K there was, in addition to Li at substitutional sites, Li which was at sites which were displaced by 0.07nm from the substitutional position; along either the <111> or <100> axes. At temperatures above 470K, out-diffusion of Li to the surface was observed.

M.Restle, K.Bharuth-Ram, H.Quintel, C.Ronning, H.Hofsäss, U.Wahl, S.G.Jahn, Isolde: Journal of Crystal Growth, 1996, 161, 168-71