The kinetics of the reaction of H with Zr were studied at 600 to 900C by using a weight-gain method in an Ar atmosphere. The rate-controlling step of the reaction was the diffusion of H through the Zr lattice. The diffusion of H in γ-ZrH was studied at 660 to 850C, and the results were found to be described by:

D (cm2/s) = 6.20 x 10-3 exp[-15800/RT]

J.K.Park, J.Y.Lee: Kumsok Hakhoe Chi 1976, 14[3], 279-87

 

Table 196

Parameters for H Diffusion ZrHx at 20 to 200C

 

x

Do (cm2/s)

E (kcal/mol)

1.92

1 x 10-7

12.3

1.85

2 x 10-7

11.9

1.76

3 x 10-7

11.5

1.58

1 x 10-7

10

1.56

1 x 10-7

10

1.53

1 x 10-7

9.9