Auger electron spectroscopic techniques were used to monitor the diffusion of O away from the surface of (001) monocrystals. The experimental data were modelled by using an infinitely thin O layer, or thicker layers. It was found that the former model best described the diffusion behavior under the present experimental conditions. No problems arose from the presence of oxide on the surface. The results could be described by the expression:

D (cm2/s) = 0.0414 exp[-199.1(kJ/mol)/RT]

and reflected the diffusion of O along the c-axis. The fundamental vibrational frequency for the -Zr lattice was calculated to be 6.3 x 1013/s. This value was in good agreement with the Debye frequency for Zr.

B.J.Flinn, C.S.Zhang, P.R.Norton: Physical Review B, 1993, 47[24], 16499

 

Table 279

Diffusivity of 95Nb in β-Zr

 

Temperature (K)

Pressure (MPa)

D (m2/s)

1273

110

4.438 x 10-14

1273

303

4.317 x 10-14

1273

601

3.957 x 10-14

1273

904

3.793 x 10-14

1273

1110

3.672 x 10-14

1273

1300

3.147 x 10-14

1423

103

1.732 x 10-13

1423

303

1.576 x 10-13

1423

605

1.534 x 10-13

1423

903

1.467 x 10-13

1423

1101

1.373 x 10-13

1423

1301

1.360 x 10-13