Diffusion measurements were carried out on polycrystalline synthetic chalcocite, chalcopyrite and bornite (at temperatures ranging from 5 to 50C) by using an electrochemical potentiometric method. It was found that the chemical diffusivities could be described by:

chalcocite:     D (cm2/s) = 38.7 exp[-5600/T]

chalcopyrite:     D (cm2/s) = 15.4 exp[-6000/T]

bornite:     D (cm2/s) = 14.5 exp[-4900/T]

The component diffusion coefficients were deduced by using thermodynamic factors of 4250, 6500 and 1500, respectively. These diffusion coefficients were in reasonable agreement with the published results of a tracer study that had been performed at much higher temperatures.

R.Berger, R.V.Bucur: Solid State Ionics, 1996, 89[3-4], 269-78