The permeability time-lag method was used to measure the temperature dependence of H diffusion at temperatures ranging from 558 to 936C (table 155). Within this temperature range, the diffusivity could be described by:

D (m2/s) = 6.48 x 10-7 exp[-26.3(kJ/mol)/RT]

H.Matsuta, R.B.McLellan: Journal of the Physics and Chemistry of Solids, 1979, 40[9], 697-9

 

 

 

Table 155

Diffusion of H in Pt

 

Temperature (C)

D (m2/s)

558

1.26 x 10-8

606

1.50 x 10-8

666

1.92 x 10-8

726

2.45 x 10-8

748

2.33 x 10-8

751

3.25 x 10-8

772

2.80 x 10-8

797

3.40 x 10-8

804

2.93 x 10-8

831

3.12 x 10-8

885

3.66 x 10-8

896

4.20 x 10-8

936

4.05 x 10-8

872

3.63 x 10-8

767

2.80 x 10-8

754

3.30 x 10-8

735

2.75 x 10-8

713

2.45 x 10-8

679

2.32 x 10-8

630

1.93 x 10-8