Chemical relaxation experiments were performed at 1000C in order to study variations in the apparent diffusivity as a function of O partial pressures of between 0.0001 and 1atm. A slow surface reaction was found to be responsible for variations in the apparent diffusivity. In the true diffusional regime, the chemical diffusion coefficient was equal to about 9.2 x 10-7cm2/s (table 47).

F.Morin, R.Dieckmann: Journal of the Physics and Chemistry of Solids, 1990, 51[3], 283-8

 

 

 

 

Table 47

Chemical Diffusion Data for CoO Monocrystals

 

Crystal Size (mm)

Atmosphere

PO2 (atm)

D (cm2/s)

1 x 1.1 x 15

pure O2

1.03 x 10-1

6.16 x 10-7

1 x 1.1 x 15

pure O2

4.73 x 10-2

4.90 x 10-7

1 x 1.1 x 15

pure O2

9.76 x 10-1

8.27 x 10-7

1 x 1.1 x 15

pure O2

1.06 x 10-1

6.48 x 10-7

1 x 1.1 x 15

pure O2

9.99 x 10-1

6.69 x 10-7

1 x 1.1 x 15

pure O2

9.78 x 10-1

5.66 x 10-7

1 x 1.1 x 15

pure O2

7.02 x 10-1

6.10 x 10-7

1 x 1.1 x 15

pure O2

5.73 x 10-1

6.71 x 10-7

1 x 1.1 x 15

pure O2

9.97 x 10-1

4.51 x 10-7

1 x 1.1 x 15

pure O2

9.40 x 10-11

9.10 x 10-7

1 x 1.1 x 15

pure O2

9.30 x 10-11

9.03 x 10-7

4.4 x 4.4 x 16

pure O2

1.33 x 100

9.27 x 10-7

4.4 x 4.4 x 16

pure O2

1.01 x 100

9.57 x 10-7

4.4 x 4.4 x 16

pure O2

3.05 x 10-1

9.38 x 10-7

4.4 x 4.4 x 16

pure O2

1.04 x 100

7.53 x 10-7

4.4 x 4.4 x 16

pure O2

1.02 x 100

9.19 x 10-7

4.4 x 4.4 x 16

pure O2

9.40 x 10-11

9.01 x 10-7

1 x 1.1 x 15

N2-1.14%O2

1.25 x 10-2

1.34 x 10-7

1 x 1.1 x 15

N2-1.14%O2

1.24 x 10-2

5.23 x 10-8

1 x 1.1 x 15

N2-1.14%O2

1.13 x 10-2

9.30 x 10-8

4.4 x 4.4 x 16

N2-1.13%O2

1.19 x 10-2

7.26 x 10-7

4.4 x 4.4 x 16

N2-1.13%O2

1.13 x 10-2

7.35 x 10-7

4.4 x 4.4 x 16

N2-1.13%O2

1.29 x 10-2

5.72 x 10-7

4.4 x 4.4 x 16

N2-1.13%O2

3.48 x 10-3

6.80 x 10-7

4.4 x 4.4 x 16

N2-1.13%O2

9.38 x 10-4

6.32 x 10-7

4.4 x 4.4 x 16

N2-1.13%O2

7.87 x 10-3

4.09 x 10-7