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 2
Self-Diffusion on = 5, = 53.1 {012} Ag Tilt Boundaries,
Parallel and Perpendicular to the <001> Tilt Axis
Temperature (K) | Orientation | D (m3/s) |
871.5 | || | 7.13 x 10-20 |
773 | || | 3.62 x 10-20 |
723 | || | 2.55 x 10-20 |
674 | || | 1.51 x 10-20 |
653 | || | 1.32 x 10-20 |
593 | || | 6.00 x 10-21 |
873 | | 7.10 x 10-20 |
771.5 | | 3.49 x 10-20 |
771 | | 3.25 x 10-20 |
723 | | 2.56 x 10-20 |
674 | | 1.72 x 10-20 |
653.5 | | 1.43 x 10-20 |
593 | | 7.00 x 10-21 |