It was pointed out that the use of implanted mass-separated carrier-free 105Ag radio-tracers improved the sensitivity of measurements of grain-boundary penetration profiles. By this means, the grain-boundary self-diffusion coefficient was directly deduced from experiments which had been performed under type-C kinetics conditions (tables 3 and 4). Upon multiplying the grain-boundary diffusivity (tables 5 and 6) by a grain-boundary width of 0.5nm, the results were found to be in agreement with the diffusivities which had been measured under type-B kinetic conditions at temperatures of between 911 and 540K and had been extrapolated to temperatures of between 455 and 353K. The dislocation density was directly determined from the near-surface portion of the type-C diffusion profiles. Analysis of the results (table 7) indicated a dislocation core diameter of about 0.5nm.
J.Sommer, C.Herzig: Journal of Applied Physics, 1992, 72[7], 2758-66
Table 3
Volume Diffusivity of 110mAg in Ag Polycrystals
Temperature (K) | D (m2/s) |
911 | 7.56 x 10-16 |
776 | 1.53 x 10-17 |
751 | 6.43 x 10-18 |
723 | 2.23 x 10-18 |
701 | 9.18 x 10-19 |
672 | 2.60 x 10-19 |
622 | 2.27 x 10-20 |
565 | 8.29 x 10-22 |
564 | 7.78 x 10-22 |
560 | 6.00 x 10-22 |
554 | 4.05 x 10-22 |
544 | 2.06 x 10-22 |
537 | 1.26 x 10-22 |
497 | 5.91 x 10-24 |
478 | 1.19 x 10-24 |
452 | 9.43 x 10-26 |
424 | 5.03 x 10-27 |
423 | 4.64 x 10-27 |
394 | 1.29 x 10-28 |
Table 4
Volume Diffusivity of 105Ag in Ag Polycrystals
Temperature (K) | D (m2/s) |
455 | 1.34 x 10-25 |
424 | 5.03 x 10-27 |
394 | 1.29 x 10-28 |
353 | 3.14 x 10-31 |
Table 5
Grain Boundary Diffusivity of 110mAg in Ag Polycrystals
Temperature (K) | D (m3/s) |
911 | 1.82 x 10-19 |
776 | 2.49 x 10-20 |
751 | 1.81 x 10-20 |
723 | 1.45 x 10-20 |
701 | 9.12 x 10-21 |
672 | 6.88 x 10-21 |
622 | 2.04 x 10-21 |
565 | 8.00 x 10-22 |
564 | 4.87 x 10-22 |
560 | 5.40 x 10-22 |
554 | 5.17 x 10-22 |
544 | 3.40 x 10-22 |
537 | 2.49 x 10-22 |
497 | 5.92 x 10-23 |
478 | 1.09 x 10-23 |
452 | 1.89 x 10-24 |
424 | 1.77 x 10-24 |
423 | 1.46 x 10-24 |
394 | 6.52 x 10-26 |
Table 6
Grain Boundary Diffusivity of 105Ag in Ag Polycrystals
Temperature (K) | D (m2/s) |
455 | 2.57 x 10-14 |
424 | 2.24 x 10-14 |
394 | 3.84 x 10-15 |
353 | 1.16 x 10-16 |
Table 7
Pipe Diffusivity of Ag Isotopes in Ag Polycrystals
Temperature (K) | Isotope | D (m2/s) |
455 | 105Ag | 5.26 x 10-15 |
424 | 105Ag | 4.64 x 10-15 |
424 | 110mAg | 4.03 x 10-15 |
394 | 105Ag | 1.12 x 10-15 |
394 | 110mAg | 3.36 x 10-15 |