Tritium diffusion in single crystals of rutile was measured between 155 and 300C. The diffusivities were deduced from concentration profiles obtained from microdensitometer traces of autoradiographs generated by β-decay of the tritium. The diffusivity was anisotropic, with estimated diffusivities given by:

a-axis:     D(cm2/s) = 2.7 x 10-6exp[-13.100(kcal/mol)/RT]

c-axis:     D(cm2/s) = 7.5 x 10-6exp[-9.040(kcal/mol)/RT]

Diffusion of Tritium in Rutile (TiO2). Caskey, G.R.: Materials Science and Engineering, 1974, 14[2], 109-14

Table 11

Diffusion coefficient for T diffusion parallel

to the c-axis of rutile (dominant mechanism)

Temperature (C)

Equilibrium O Pressure (atm)

D (cm2/s)

254

7 x 10-39

5.35 x 10-10

304

1 x 10-34

2.24 x 10-9

350

3 x 10-31

7.96 x 10-9

401

3 x 10-28

2.18 x 10-8

406

3 x 10-28

2.38 x 10-8

500

1 x 10-23

1.20 x 10-7

504

4 x 10-16

1.18 x 10-7

509

2 x 10-29

7.94 x 10-8

510

1 x 10-23

1.06 x 10-7

602

7 x 10-20

3.29 x 10-7

700

5 x 10-17

9.60 x 10-7