TEMPERATURE-DEPENDENCE OF THE TOTAL DYNAMIC STRUCTURE FACTOR OF THE METALLIC-GLASS NI33ZR67

The temperature dependence of the atomic dynamics of the metallic glas s Ni33Zr67 has been investigated in a large temperature range (60 to 5 00 K) via the generalized vibrational density of states (GVDOS) G(omeg a) and the total dynamic structure factor S(Q, omega) determined by co ld neutron inelastic scattering techniques. In the accessible range of energies (0.8 less than or equal to <(h<over bar> omega less than or equal to 40 meV) and momentum transfers (h) over bar Q (8 less than or equal to Q less than or equal to 26 nm(-1), a simple analysis of the fully corrected data does not show any appreciable (> 5%) influence of anharmonic vibrations. It is concluded that the modes giving rise to the additional intensity at low energy in the energy region of the Bos on peak do not stem from the same collective movement of building unit s (e.g., SiO4 tetrahedra in SiO2) as in glasses with covalent bonding or in polymers, but rather from regions with different atomic density distributions.