Classical diffusion equations were applied to the interdiffusion of a sandwich of amorphous Si and Al at 470 to 570C. It was found that the diffusivity of Si in Al could be described by:

D (cm2/s) = 1.25 x 10-7 exp[-0.80(eV)/kT]

H.Qingheng, E.S.Yang, H.Izmirilyan: Solid State Electronics, 1982, 25[12], 1187-8