The self-diffusivity of Be in this bulk metallic amorphous alloy was investigated. It was found that, below the glass transition temperature, the results suggested the operation of a single atomic jump diffusion mechanism for Be. Here, the data could be described by:

D (m2/s) = 1.82 x 10-11exp[-1.05(eV)/kT]

By taking account of the change in configurational entropy due to the glass transition, the mechanism of Be diffusion in the supercooled liquid state (above the glass transition) was explained in terms of single atomic jumps in a slowly changing configuration of neighboring atoms. Here, the data could be described by:

D (m2/s) = 1.1 x 1017exp[-4.47(eV)/kT]

U.Geyer, S.Schneider, W.L.Johnson, Y.Qiu, T.A.Tombrello, M.P.Macht: Physical Review Letters, 1995, 75[12], 2364-7. See also: Materials Science Forum, 1996, 225-227, 89-94