The effect of magnetic ordering upon diffusion in the α-phase was investigated, at 673 to 1163K, by using several techniques: serial sectioning, heavy-ion Rutherford back-scattering spectrometry, Rutherford back-scattering spectrometry. The Arrhenius plot was extended to cover 10 decades (table 8, figure 6); thus making clear the variation in the slope at the Curie temperature and a slight upwards curvature in the ferromagnetic region. The parameter which took account of the effect of magnetic order on vacancy mobility during Sn diffusion was quite similar to that observed in the case of Fe self-diffusion, where no magnetic interaction between the impurity and the matrix was postulated.

Diffusion of Tin in α-Iron. D.N.Torres, R.A.Perez, F.Dyment: Acta Materialia, 2000, 48[11], 2925-31

 

Table 8

Diffusivity of Sn in α-Fe

 

Temperature (K)

Technique*

Source

D (m2/s)

673

RBS

implanted

2.0 x 10-23

696

RBS

implanted

4.0 x 10-23

723

RBS

implanted

1.0 x 10-21

773

RBS

implanted

1.5 x 10-20

823

HIRBS

implanted

9.5 x 10-20

873

RBS

evaporated

1.1 x 10-18

923

RBS

implanted

8.0 x 10-18

953

HIRBS

evaporated

4.0 x 10-17

973

HIRBS

evaporated

7.1 x 10-17

993

grinding

drop

9.5 x 10-17

1000

HIRBS

implanted

2.1 x 10-16

1023

HIRBS

implanted

5.7 x 10-16

1048

grinding

drop

2.5 x 10-15

1103

grinding

drop

8.3 x 10-15

1163

grinding

drop

2.1 x 10-14

HIRBS: heavy-ion Rutherford back-scattering spectrometry

RBS: Rutherford back-scattering spectrometry

 

 

 

Figure 6

Diffusivity of Sn in α-Fe