Self-diffusion coefficients in the molten eutectic composition were measured by using a capillary method and 18F tracers. The resultant data, for 480 to 663C, could be described by:
D (m2/s) = 1.77 x 10-7 exp[-30.8(kJ/mol)/RT]
N.Umesaki, N.Iwamoto, Y.Tsunawaki, H.Ohno, K.Furukawa: Faraday Transactions, 1981, 77[1], 169-75
Table 171
Diffusivity of Al in Molten Cryolite
Containing 5wt%Al2O3
Temperature (C) | D (cm2/s) |
995 | 4.902 x 10-4 |
1007 | 4.850 x 10-4 |
1018 | 5.180 x 10-4 |
1044 | 6.630 x 10-4 |
1072 | 7.900 x 10-4 |
Table 172
Diffusivity of AlF and Na2F Ions in Na3AlF6-Al2O3 Melts
Al2O3 (wt%) | Temperature (C) | D (cm2/s) |
5 | 980 | 5.90 x 10-4 |
5 | 1000 | 6.30 x 10-4 |
5 | 1020 | 7.20 x 10-4 |
5 | 1040 | 9.40 x 10-4 |
5 | 1060 | 1.15 x 10-3 |
1 | 1060 | 1.20 x 10-3 |
2 | 1060 | 1.16 x 10-3 |
4 | 1060 | 1.18 x 10-3 |
6 | 1060 | 1.15 x 10-3 |
8 | 1060 | 1.00 x 10-3 |
9 | 1060 | 6.68 x 10-4 |
11 | 1060 | 2.51 x 10-4 |