The migration of 95Zr was studied at temperatures ranging from 1200 to 1518K (table 281). The diffusion data obeyed the relationship:
D(m2/s) = 1.74 x 10-9exp[-23.77(kcal/mol)/RT]
No appreciable enhancement of 95Zr diffusion rates was observed at Ag contents of up to 1.45at%. At higher concentrations, the diffusivity increased with increasing Ag content. The self-diffusion data were analyzed in terms of the so-called omega-embryo mechanism. The instability temperature decreased with increasing concentration of β-stabilizer.
R.V.Patil: Journal of Nuclear Materials, 1992, 187[3], 197-203
Table 280
Diffusion of O into Zr from Various Planes
Temperature (K) | Plane | D (m2/s) |
523 | (00•1) | 5.129 x 10-19 |
573 | (00•1) | 9.333 x 10-18 |
623 | (00•1) | 2.786 x 10-16 |
723 | (00•1) | 1.164 x 10-14 |
523 | (10•0) | 2.512 x 10-19 |
573 | (10•0) | 4.989 x 10-18 |
623 | (10•0) | 1.844 x 10-16 |
673 | (10•0) | 1.918 x 10-15 |
723 | (10•0) | 1.937 x 10-14 |
773 | (10•0) | 1.227 x 10-13 |
Table 281
Diffusion of 95Zr in Zr
Temperature (K) | D (m2/s) |
1200 | 9.20 x 10-14 |
1250 | 1.26 x 10-13 |
1282 | 1.55 x 10-13 |
1333 | 2.16 x 10-13 |
1385 | 2.99 x 10-13 |
1424 | 3.76 x 10-13 |
1455 | 4.84 x 10-13 |
1478 | 5.05 x 10-13 |
1501 | 6.30 x 10-13 |
1518 | 8.05 x 10-13 |