Isotope effect of manganese and simultaneous impurity diffusion of chromium and zinc in copper

The isotope effect E = 0.310 as a mean value is measured at T = 1200 K for impurity diffusion of 52 Mn/ 54 Mn in copper. The corresponding correlation factor f 2 = 0.36 is relatively small in comparison with the published results of Fe, Co, and Ni in Cu. The small value of f 2 and the faster diffusivity of Mn with regard to self‐diffusion of Cu can be explained by the strong lattice distortions of Mn in Cu. Valence effects are accordingly less important. The frequency ratios for vacancy jumps and the vacancy flow effect are calculated. The free binding enthalpy of the vacancy—impurity complex is estimated. Simultaneously to Mn, the tracer diffusion of 51 Cr and 65 Zn is determined. The different evaporation effects of the tracer are taken into account in the evaluation of the diffusion coefficients.