Vibrational states in a model amorphous Cu57Zr43

The vibrational density of states of a model amorphous Cu 57 Zr 43 alloy was calculated by the recursion method. A general agreement was obtained between the calculated result and the experimental one reported for amorphous Cu 44 Zr 56 alloy. The wavenumber-dependent spectra for both longitudinal and transverse excitations were also calculated. The elastic constants estimated from the sound velocity (Young's modulus E=0.80 Mbar, shear modulus G=0.30 Mbar) agreed fairly well with the experimental results (E=0.745 Mbar, G=0.244 Mbar). The Debye temperature was estimated to be 327K, which is 30K higher than that determined from experimental DOS spectra.