The tracer diffusion coefficient for 93Nb in rutile single crystals was determined by using secondary ion mass spectrometry. The results in air (pO2 = 21kPa) at 1073 to 1573K could be described by:

D(m2/s) = 4.7 x10-7exp[-244(kJ/mol)/RT]

By comparison with the self-diffusion of 44Ti in rutile, 93Nb was deduced to diffuse via the interstitialcy mechanism.

Bulk Diffusion of Niobium in Single-Crystal Titanium Dioxide. L.R.Sheppard, A.J.Atanacio, T.Bak, J.Nowotny, K.E.Prince: Journal of Physical Chemistry B, 2007, 111[28], 8126-30

 

Table 73

Diffusion of 15N in TiN

 

Layer

Temperature (C)

D (cm2/s)

shallow

850

7.3 x 10-17

deep

850

1.33 x 10-15

shallow

900

1.53 x 10-16

deep

900

1 x 10-15

shallow

1000

5.7 x 10-16

deep

1000

1.44 x 10-15

shallow

1085

3.11 x 10-15

deep

1085

7.94 x 10-15

shallow

1100

3.1 x 10-15

deep

1100

4.5 x 10-15

shallow

1110

4.15 x 10-15

deep

1110

6.7 x 10-15

shallow

1150

8 x 10-15

deep

1150

2.13 x 10-14

shallow

1230

1.58 x 10-14

deep

1230

3.68 x 10-14

shallow

1300

3.6 x 10-14

deep

1300

6.85 x 10-14

shallow

1400

1.51 x 10-13

deep

1400

2.31 x 10-13