Diffusion in the samples was studied under hydrostatic pressures of between 0.0001 and 3.26GPa, at 723 to 881K, by using electron probe microanalysis. The activation energy for interdiffusion increased with increasing pressure, and the activation volume for interdiffusion lay between 7.8 x 10-6 and 9.1 x 10-6m3/mol. The data could be described by:

D (cm2/s) = 4.06 x 10-5 exp[-29.5(kcal/mol)/RT]

for a pressure of 0.0001GPa, by:

D (cm2/s) = 3.17 x 10-4 exp[-37.1(kcal/mol)/RT]

for a pressure of 2GPa, and by:

D (cm2/s) = 9.92 x 10-4 exp[-41(kcal/mol)/RT]

for a pressure of 3GPa.

Y.Minamino, T.Yamane, M.Koizumi, M.Shimada, N.Ogawa: Zeitschrift für Metallkunde, 1982, 73[2], 124-8