The tracer diffusivity of O was measured by means of secondary ion mass spectrometry. The results for 1093 to 1455K (table 65) could be described by:

D (m2/s) = 1.17 x 10-1exp[-375(kJ/mol)/RT]

The diffusivity increased, with increasing non-stoichiometry, towards O-rich compositions.

 

S.Yamaguchi, M.Someno: Transactions of the Japan Institute of Metals, 1982, 23[5], 259-66

 

Table 65

O Tracer Diffusion in Fe1-xO (Wüstite)

Temperature (K)

PO2(Pa)

x

D (m2/s)

1093

3.66 x 10-13

0.093

5.98 x 10-18

1193

2.20 x 10-11

0.060

5.34 x 10-18

1290

1.20 x 10-8

0.104

3.72 x 10-16

1290

1.59 x 10-9

0.074

5.64 x 10-17

1290

4.85 x 10-9

0.094

1.88 x 10-16

1290

5.05 x 10-10

0.059

5.63 x 10-16

1455

1.98 x 10-7

0.064

5.11 x 10-15

1455

6.26 x 10-7

0.080

4.44 x 10-15

1455

1.90 x 10-6

0.097

8.61 x 10-15

1455

4.70 x 10-6

0.110

7.51 x 10-15

1455

1.99 x 10-5

0.125

1.81 x 10-14