The simultaneous diffusion of Cd and Pb was studied. The experimental conditions were such that the concentration of Pb2+ was about 10 times the concentration of Cd2+. The Cd2+ profile exhibited an inflection point between a region of rapid diffusion and a region of more normal diffusion. This was attributed to a normal common-ion reaction. The diffusion profile for the Pb ion could be fitted by:

D (cm2/s) = 1.00 x 10-3 exp[-0.908(eV)/kT]

J.L.Krause, W.J.Fredericks: Journal de Physique - Colloques, 1973, 9, 25-35

 

Table 71

Diffusivity of SO4 in KCl Crystals

 

Temperature (C)

D (cm2/s)

738.4

1.33 x 10-7

683.7

5.89 x 10-8

637.3

2.48 x 10-8

612.1

1.90 x 10-8

568.6

7.65 x 10-9