The diffusion of Y in α-phase alumina was measured, at temperatures ranging from 1150 to 1500C, by means of secondary ion mass spectrometry. It was found that the diffusion data could be described by:

D (m2/s) = 1.2 x 10-10 exp[-295(kJ/mol)/RT]

These results were similar to those for Cr diffusion in this material, although the Y3+ ion was much larger than the Cr3+ ion.

E.G.Moya, F.Moya, B.Lesage, M.K.Loudjani, C.Grattepain: Journal of the European Ceramic Society, 1998, 18[6], 591-4

 

Table 14

Sub-Boundary Diffusivity of O in Undoped -Al2O3

 

Temperature (C)

D (cm3/s)

D (cm2/s)

1500

2.6 x 10-20

8.3 x 10-13

1520

9.1 x 10-20

2.9 x 10-12

1550

2.3 x 10-19

7.3 x 10-12

1570

8.1 x 10-19

2.6 x 10-11

1577

3.2 x 10-19

1.0 x 10-11

1600

2.0 x 10-18

6.4 x 10-11

1630

2.9 x 10-18

9.1 x 10-11

1650

5.0 x 10-18

1.6 x 10-10

1660

6.4 x 10-18

2.0 x 10-10

1675

3.2 x 10-18

1.0 x 10-10

1685

1.1 x 10-17

3.5 x 10-10

1707

2.3 x 10-17

7.3 x 10-10

1720

2.9 x 10-17

9.2 x 10-10

1751

1.5 x 10-17

4.8 x 10-9