Glasses with the composition, Li2O•2SiO2, were annealed in 18O at temperatures of between 325 and 390C. It was found that the O diffusivity data could be described by:

D (m2/s) = 2.90 x 10-12exp[-121(kJ/mol)/RT]

A discrepancy between these results, and previous ones for the same material, was attributed to the interfering effect of OH- in the specimens.

T.Sakai, K.Takizawa, T.Eguchi, J.Horie: Journal of Materials Science Letters, 1995, 14[16], 1126-8