The available experimental data on the diffusion of this element in body-centered cubic Fe were analyzed by using a model which took account of the effect of magnetic transitions in the phase. It was found that the diffusion of N in this phase could be described by:

D (m2/s) = 2.42 x 10-7exp[-59.7(kJ/mol)(1+0.266s2)/RT]

where s was the ratio of the spontaneous magnetization in Fe, at a given temperature, to that at 0K. The increase in activation energy due to magnetic spin ordering was 16kJ/mol. This was equal to about half of the activation energy for self-diffusion in -Fe.

Y.Iijima: Journal of Alloys and Compounds, 1996, 234[2], 290-4

 

Table 64

Diffusivity of 95Nb in α-Fe

 

Temperature (K)

D (m2/s)

1163

4.04 x 10-15

1148

3.61 x 10-15

1133

2.07 x 10-15

1123

1.53 x 10-15

1103

9.89 x 10-16

1083

5.42 x 10-16

1073

3.86 x 10-16

1053

1.53 x 10-16

1033

5.48 x 10-17

993

1.58 x 10-17

983

1.43 x 10-17

973

7.29 x 10-18

923

5.04 x 10-19

888

8.58 x 10-20

873

4.05 x 10-20

858

1.76 x 10-20

843

8.87 x 10-21

823

3.37 x 10-21