The diffusion was investigated using EPMA at 300 to 400C. The triple product sδDgb was calculated using the Fisher-Gibbs methods: measuring the grain-boundary copper concentration as a function of penetration depth, or the contour angle at the top of the diffusion wedge. In the first case,

sδDgb(m3/s) = 5.1 x 10-11exp[-102(kJ/mol)/RT]

and, in the second case:

sδDgb(m3/s) = 1.4 x 10-11exp[-94(kJ/mol)/RT]

N.Dolgopolov, A.Rodin, A.Simanov, I.Gontar: Polish Journal of Chemistry, 2009, 83[8], 1507-13. See also: Russian Journal of Non-Ferrous Metals, 2000, 50[2], 133-7 and Materials Letters, 2008, 62[30], 4477-9