The tracer diffusivity of Co in amorphous samples was measured, as a function of pressure, for x-values of between 0.42 and 0.62 (table 215). It was concluded that the activation volume for diffusion in these alloys was between 8 x 10-30 and 2 x 10-29m3, and depended upon the alloy composition. The results were explained in terms of an interstitial-type diffusion mechanism for Co in amorphous Ni-Zr alloys.

H.J.Höfler, R.S.Averback, G.Rummel, H.Mehrer: Philosophical Magazine Letters, 1992, 66[6], 301-6

 

Table 213

Diffusivity of 113Sn in Ni61Sn39 Single Crystals

 

Temperature (K)

Direction wrt c-axis

D (cm2/s)

1477

perpendicular

3.76 x 10-10

1477

parallel

5.03 x 10-10

1442

perpendicular

1.47 x 10-10

1442

parallel

2.24 x 10-10

1341

perpendicular

3.97 x 10-11

1341

parallel

5.21 x 10-11

1275

perpendicular

5.96 x 10-12

1275

parallel

1.03 x 10-11

1192

perpendicular

1.10 x 10-12

1192

parallel

1.96 x 10-12

Table 214

Diffusivity of 63Ni in Ni-Ti-Cu Alloys

 

Temperature (K)

Alloy (at%)

D (m2/s)

1288

50.07Ti

1.2 x 10-14

1230

50.07Ti

5.7 x 10-15

1144

50.07Ti

1.3 x 10-15

1103

50.07Ti

6.8 x 10-16

1073

50.07Ti

5.2 x 10-16

1023

50.07Ti

2.7 x 10-16

933

50.07Ti

4.9 x 10-17

783

50.07Ti

7.7 x 10-19

998

48.83Ti-9.29Cu

5.7 x 10-15

908

48.83Ti-9.29Cu

1.8 x 10-16