The diffusivities (table 126) were determined by using radiotracer techniques. It was found that the diffusivity of Fe at 850C was equal to 2 x 10-14cm2/s and was independent of the N content. The diffusion values for Na 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 126
Diffusion of Fe and Na in SiO2-x(mol%)Y2O3-y(mol%)Al2O3-z(mol%)AlN Glasses
x | y | z | N (at%) | Diffusant | Temperature (C) | D (cm2/s) |
17.00 | - | 25.00 | 8.09 | Fe | 850 | 1.95 x 10-14 |
17.52 | 3.09 | 19.58 | 6.08 | Fe | 850 | 2.00 x 10-14 |
18.08 | 6.38 | 13.82 | 4.12 | Fe | 850 | 2.03 x 10-14 |
17.52 | 3.09 | 19.58 | 6.08 | Fe | 800 | 5.10 x 10-15 |
17.00 | - | 25.00 | 8.09 | Na | 690 | 1.74 x 10-13 |
18.08 | 6.38 | 13.82 | 4.12 | Na | 690 | 5.89 x 10-13 |