Lattice-dynamical effects and hyperfine interactions in Cu-Zn alloys

The temperature dependence of lattice-dynamical effects has been investigated between 4.2 and 60 K in Cu-Zn alloys containing 15.9 at.% Zn (α-phase) and 49.2 at.% Zn (β'-phase). A comparison of the 93.31-keV 67 Zn Mossbauer data on the Lamb-Mossbauer factor (LMF) and on the second-order Doppler effect (SOD) for both structures as well as low-temperature x-ray experiments show that no β'-phase exists in the α-alloy contrary to the prediction of a hypothetical phase diagram proposed recently. The LMF and SOD decrease drastically with increasing temperature