The diffusion of 44Ti in 4N-purity rutile was studied by using thin-layer deposition and serial sectioning. The results (table 15) could be described by:

a-axis:     D(cm2/s) = 2.0 x 10-3exp[-48.5(kcal/mol)/RT]

c-axis:     D(cm2/s) = 4.6 x 10-2exp[-59.9(kcal/mol)/RT]

Cation self-diffusion in TiO2 was studied both theoretically and experimentally and it as found that the relative diffusion coefficients in the a- and c-directions could be used, together with their partial correlation functions, to identify the jumps taking place in the body-centered tetragonal cation sub-lattice. Three possible types of jump were considered: a-direction, c-direction and body diagonal. The information obtained showed that the diagonal jump could not be unique for this system but had to be accompanied by a significant fraction of c-direction jumps.

Cation Self Diffusion in Rutile. Lundy, T.S., Coghlan, W.A.: Journal de Physique -  Colloques, 1973, C9[34], 299-302

 

Table 15

Diffusion of 44Ti in rutile

Temperature (C)

Axis

D (cm2/s)

1197

c

5.9 x 10-11

1247

c

1.36 x 10-10

1293

c

1.64 x 10-10

1347

c

3.56 x 10-10

1350

c

4.06 x 10-10

1398

c

6.74 x 10-10

1455

c

9.53 x 10-10

1477

c

1.825 x 10-9

1510

c

2.36 x 10-9

1197

a

1.617 x 10-10

1247

a

2.74 x 10-10

1293

a

5.88 x 10-10

1347

a

4.4 x 10-10

1350

a

4.7 x 10-10

1477

a

2.8 x 10-9

1510

a

2.9 x 10-9