Methods were described which permitted the determination of diffusion coefficients and diffusivity-solubility products. The methods were applied to the Cu-O system at 600 to 1000C, and led to the expression:

D (cm2/s) = 5.8 x 10-3 exp[-13.7(kcal/mol)/RT]

R.Kirchheim: Acta Metallurgica, 1979, 27[5], 869-78