The diffusivities (table 184) were determined by using radiotracer techniques. The diffusion values at 690C decreased from 5.89 x 10-13 to 1.74 x 10-13 cm2/s upon increasing the N content from 4.12 to 8.09at%.

T.Das, A.S.Sanyal, J.Mukerji: Physics and Chemistry of Glasses, 1991, 32[4], 180-2

Table 184

Diffusion of Na in SiO2-xY2O3-yAl2O3-z(mol%)AlN Glasses