The diffusivity in Pd-(1 to 20)Co, Pd-(1 to 10)Cr, Pd-(1 to 20)Fe, Pd-(1 to 11)Mn and Pd-(2 to 42)at%Ni alloys was measured (table 146), at between 270 and 350K, by using electrolytic methods. An analysis of the results indicated that the substitutional solute atoms created trapping sites for H atoms. These were quite shallow (0 to 4kJ/mol), as compared with those created by the cold deformation of pure Pd (20 to 40kJ/mol). It was found that noble metals created the shallowest trapping sites, while group-V metals created the deepest ones.

The Diffusivity of Hydrogen in Palladium-Based Solid Solutions. M.Yoshihara, R.B.McLellan: Acta Metallurgica, 1982, 30[8], 1605-11

 

Table 146

Parameters for H Diffusion in Pd-Based Alloys

 

Solute

C (at%)

Do (m2/s)

E (kJ/mol)

Co

1.29

0.386

23.06

Co

2.08

0.394

23.23

Co

5.35

0.551

24.74

Co

9.61

1.316

28.36

Co

15.19

2.015

31.24

Co

19.76

9.654

37.36

Cr

1.38

0.290

22.47

Cr

1.99

0.505

24.28

Cr

3.21

1.015

26.52

Cr

5.27

2.742

29.92

Cr

7.79

2.672

31.82

Cr

10.39

4.793

34.77

Fe

1.12

0.336

22.77

Fe

2.15

0.310

22.80

Fe

5.45

0.645

25.73

Fe

11.09

1.797

30.61

Fe

20.16

44.973

44.43

Mn

1.40

0.323

22.65

Mn

2.22

0.320

22.97

Mn

2.98

0.367

23.76

Mn

5.10

1.012

27.21

Mn

11.05

4.656

33.52

Ni

1.96

0.306

22.45

Ni

4.18

0.324

22.64

Ni

10.30

0.314

22.74

Ni

14.87

0.259

22.84

Ni

20.22

0.224

23.30

Ni

30.95

0.302

25.13

Ni

41.83

0.463

29.75

 

Table 147

Diffusivity of H in Pd Alloys

 

Solute

C (at%)

Temperature (K)

D (m2/s)

Nb

0.1

277

1.85 x 10-11

Nb

0.1

293

3.0 x 10-11

Nb

0.1

295.5

3.4 x 10-11

Nb

0.1

307

4.8 x 10-11

Nb

0.1

327

8.0 x 10-11

Nb

1.1

278

1.48 x 10-11

Nb

1.1

288

2.96 x 10-11

Nb

1.1

295

2.6 x 10-11

Nb

1.1

296

2.6 x 10-11

Nb

1.1

296

2.8 x 10-11

Nb

1.1

306

3.7 x 10-11

Nb

1.1

317

4.9 x 10-11

Nb

1.1

324

5.8 x 10-11

Nb

1.1

331

7.3 x 10-11

Nb

1.1

333

7.6 x 10-11

Nb

2.1

280

1.35 x 10-11

Nb

2.1

295

2.25 x 10-11

Nb

2.1

296

2.4 x 10-11

Nb

2.1

296

2.35 x 10-11

Nb

2.1

296

2.23 x 10-11

Nb

2.1

306

3.0 x 10-11

Nb

2.1

315

4.25 x 10-11

Nb

2.1

322

4.75 x 10-11

Nb

3.7

280

8.1 x 10-12

Nb

3.7

294.5

1.65 x 10-11

Nb

3.7

295

1.44 x 10-11

Nb

3.7

298

1.63 x 10-11

Nb

3.7

298

1.75 x 10-11

Nb

3.7

312

2.5 x 10-11

continued

 

Table 147 (continued)

Diffusivity of H in Pd Alloys

 

Solute

C (at%)

Temperature (K)

D (m2/s)

Nb

3.7

322

3.5 x 10-11

Nb

3.7

322

3.4 x 10-11

Nb

6.5

279.5

2.1 x 10-12

Nb

6.5

290

4.1 x 10-12

Nb

6.5

295

5.5 x 10-12

Nb

6.5

295

5.4 x 10-12

Nb

6.5

299

6.0 x 10-12

Nb

6.5

304

7.6 x 10-12

Nb

6.5

308

8.7 x 10-12

Nb

6.5

312

1.04 x 10-11

Nb

6.5

321

1.36 x 10-11

Nb

6.5

323

1.50 x 10-11

Cu

1.6

273

1.5 x 10-11

Cu

1.6

284.5

2.15 x 10-11

Cu

1.6

293.5

2.9 x 10-11

Cu

1.6

294.5

3.0 x 10-11

Cu

1.6

297

3.26 x 10-11

Cu

1.6

307.5

4.42 x 10-11

Cu

1.6

319

5.8 x 10-11

Cu

3.3

273

1.25 x 10-11

Cu

3.3

284.5

1.9 x 10-11

Cu

3.3

294.5

2.6 x 10-11

Cu

3.3

296.5

2.7 x 10-11

Cu

3.3

306

3.8 x 10-11

Cu

3.3

315

4.8 x 10-11

Cu

3.3

322

5.85 x 10-11

Cu

7.5

277.5

1.22 x 10-11

Cu

7.5

286.5

1.7 x 10-11

Cu

7.5

294.5

2.2 x 10-11

continued

 

Table 147 (continued)

Diffusivity of H in Pd Alloys

 

Solute

C (at%)

Temperature (K)

D (m2/s)

Cu

7.5

311

3.6 x 10-11

Cu

7.5

322

4.4 x 10-11

Cu

12.5

273

9.3 x 10-12

Cu

12.5

286.5

1.4 x 10-11

Cu

12.5

294.5

1.85 x 10-11

Cu

12.5

296

1.74 x 10-11

Cu

12.5

297.5

2.06 x 10-11

Cu

12.5

311

2.95 x 10-11

Cu

12.5

322.5

3.97 x 10-11