Abstract
The diffusion of Fe and Ni in single-crystalline copper was investigated in the temperature range from 651 to 870 K and from 613 to 949 K, respectively. Ion-beam sputtering in combination with secondary-ion mass spectrometry was employed to measure concentration depth profiles. The temperature dependence of the diffusion coefficients of Fe and Ni in copper can be described by and . These results are compatible with earlier high-temperature tracer data. A combination of those with the present low-temperature data reveals a curvature in the respective Arrhenius plots. This curvature is ascribed to the contribution of divacancies at high temperatures. The temperature functions of and can be described with the aid of the modified electrostatic model of impurity diffusion, assuming effective values for the charge difference between host atom and impurity.
- Received 22 December 1995
DOI:https://doi.org/10.1103/PhysRevB.54.857
©1996 American Physical Society