The temperature and concentration dependences of the interdiffusion coefficients in this system were studied, at temperatures of between 1593 and 1993K, by means of electron probe microanalysis. It was found that the coefficients increased with increasing Zr content, according to the relationship:
D = Aexp[5.6C]
where A was the temperature-dependent parameter, and had the value of the tracer diffusion coefficient at infinite dilution, while C was the mole fraction of the component. The diffusivity obeyed an Arrhenius relationship, with a pre-exponential factor of between 10-7 and 10-5m2/s, and an activation energy of between 216 and 276kJ/mol; for Zr concentrations of 5 to 90%.
R.V.Patil, G.B.Kale, S.P.Garg: Journal of Nuclear Materials, 1995, 223[2], 169-73
Table 348
Diffusivity of 95Zr in β-Zr
Temperature (K) | Pressure (MPa) | D (m2/s) |
1273 | 110 | 1.438 x 10-13 |
1273 | 303 | 1.373 x 10-13 |
1273 | 601 | 1.308 x 10-13 |
1273 | 904 | 1.200 x 10-13 |
1273 | 1110 | 1.110 x 10-13 |
1273 | 1300 | 1.014 x 10-13 |
1423 | 103 | 4.055 x 10-13 |
1423 | 303 | 3.612 x 10-13 |
1423 | 605 | 3.588 x 10-13 |
1423 | 903 | 3.298 x 10-13 |
1423 | 1101 | 3.233 x 10-13 |
1423 | 1301 | 3.056 x 10-13 |