Migration of the oxide component was deduced from measurements of the rate of growth of oxide films on molten Pb. The results could be described by:

D (cm2/s) = 4.68 x 10-4 exp[-6000/T]

between 830 and 1050C.

I.V.Kazakova, B.M.Lepinskikh, S.A.Lyamkin: Inorganic Materials, 1985, 20[10], 1457-9