Oxygen self-diffusion coefficients were determined for synthetic and natural rutile single crystals under hydrothermal conditions at 100MPa and 873 to 1373K. Between 973 and 1373K, the results were characterized by two linear Arrhenius relationships:

D(m2/s) = 1.14 x 10-11 exp[-168.8(kJ/mol)/RT]

for natural rutile, and

D(m2/s) = 2.41 x 10-12 exp[-172.5(kJ/mol)/RT]

for synthetic crystals.

P.F.Dennis, R.Freer: Journal of Materials Science, 1993, 28[17], 4804-10