# Numbers for Point Defect Diffusion

| Here a few numbers to point defect diffusion
|  | Numbers like this always should be taken with a grain of salt; they are often to a bit of doubt. It is not uncommon that newer measurements or new interpretations of old measurements give quite different results.
Diffusing Atom | Host Crystal | Diffusion Mechanism | Migration Enthalpy (eV) | D0 [cm2/s]
C | Fe | interstitial | 1,25 | 0,008
N | Fe | interstitial | 0,78 | 0,007
H | Fe | interstitial | 0,43 | 0,01
Ni | Fe | substitutional | 2,86 | 0,5
Co | Fe | substitutional | 2,34 | 0,2
Si | Fe | substitutional | 2,08 | 0,4
Al | Cu | substitutional | 1,69 | 0,07
S | GaAs | substitutional | 4,0 | 4000
Zn | GaAs | substitutional | 2,47 | 1,5 · 10–8
P | Si | substitutional |  |
As | Si | substitutionell |  |
B | Si | substitutional |  |
Si | Si |  |  |
O | Si |  |  |
Cu | Si |  |  |
Li | Si |  |  |

With frame

3.1.1 Diffusion and Point Defects

Exercise 4.2-1 Diffusion During Cooling

© H. Föll (Defects - Script)