Isotope effect and correlation factor for the diffusion of cadmium in silver

Isotope effect studies for the diffusion of Cd in silver single crystals are made using the isotope pair Cd115m and Cd109 in the temperature region 730 to 906 °C. The enhancement factor ‘b’ is measured in dilute Ag-Cd alloy upto ≈3 at% cadmium at 860 and 924 °C. The data from the isotope effect and enhancement factor are combined to calculate the jump frequency ratios, using Howard and Manning's calculations. The correlation factor measured from the isotope effect experiment varies from 0.781 ± 0.087 to 0.623 ± 0.051 between temperatures of 735 to 906 °C. Values of ‘b’ at 860 and 924 °C are found to be 9.19 and 13.69, respectively. These values are consistent with the vacancy migration mechanism.