Serial sectioning and spectrophotometric analysis were used to study the diffusion of Li in high-purity single crystals. The results (table 68), for temperatures ranging from 553 and 717C, could be described by:

D (cm2/s) = 46.5 exp[-1.60(eV)/kT]

A.N.Murin, I.V.Murin, V.I.Portnyagin, U.S.Shapkina: Fizika Tverdogo Tela, 1973, 15[3], 933-4