Chemical diffusion coefficients were deduced from studies of point defect relaxation in magnetite. The vacancy and interstitial tracer diffusion coefficients (table 101) could be described by:
vacancy: D (cm2/s) = 4.33 x 10-11 exp[16770K/T]
interstitial: D (cm2/s) = 7.71 x 107 exp[73880K/T]
R.Dieckmann, H.Schmalzried: Berichte der Bunsengesellschaft für Physikalische Chemie, 1986, 90[7], 564-75
Figure 17
Permeation of O in Sr10-x/2BixFe20Oy
(Squares: x = 10, diamonds: x = 6)
Table 101
Fe Diffusion in Magnetite
Temperature (C) | Component | D (cm2/s) |
900 | vacancy | 7.24 x 10-5 |
900 | interstitial | 3.61 x 10-20 |
1000 | vacancy | 2.61 x 10-5 |
1000 | interstitial | 4.10 x 10-18 |
1100 | vacancy | 8.00 x 10-6 |
1100 | interstitial | 3.48 x 10-16 |
1200 | vacancy | 3.44 x 10-6 |
1200 | interstitial | 1.36 x 10-14 |
1300 | vacancy | 1.82 x 10-6 |
1300 | interstitial | 3.60 x 10-13 |
1400 | vacancy | 1.14 x 10-6 |
1400 | interstitial | 4.40 x 10-12 |