The diffusivity of tritium in rutile single crystals was measured parallel to the a- and c-axes at 250 to 900C. Raman‐scattering measurements were also used to aid in identifying a non-polar tritium species involved in the diffusion process. Two species, OT− ions and T2 molecules, were involved in tritium migration. The OT− ions dissociated preceding each tritium jump. Along the a-axis the T2 molecules diffused four orders of magnitude slower than did the T+ ions associated with OT−. No dependence of the tritium diffusivity upon the rutile defect structure was observed. The results for the faster mechanism of T diffusion along the a-axis (table 9) were described by:

D(cm2/s) = 1.77 x 10-2exp[-107(kJ/mol)/RT]

The results for the slower mechanism of T diffusion along the a-axis (table 10) were described by:

D(cm2/s) = 8.9 x 10-2exp[-187(kJ/mol)/RT]

The results for T diffusion along the c-axis (table 11) were described by:

D (cm2/s) = 8.5 x 10-3exp[-72.2(kJ/mol)/RT]

Tritium Diffusion in Rutile (TiO2). Cathcart, J.V., Perkins, R.A., Bates, J.B., Manley, L.C.: Journal of Applied Physics, 1979, 50[6], 4110-9