Diffusion of Ag in pyrolytically deposited carbon was determined between 450 and 800C using a He back-scattering technique. The specimens were prepared as flat deposits on a plane surface. The Ag concentrations produced by implantation were calculated before and after diffusion heat treatments at constant temperatures using back-scattering spectra and allowing for evaporation at the surface. The results could be described by:

D(cm2/s) = 10-4 exp[-1.7(eV)/kT]

P.Offermann: Journal of Nuclear Materials, 1977, 64[3], 249-53