The dynamics of Na_0.5Li_0.5 PO_3 (T_g=515 K, T_m= 749 K) a non fragile glass forming liquid has been investigated over a large temperature range (300 - 1000K) and in a wide energy window using various experimentla techniques. The susceptibility spectra obtained by coherent neutron scattering and depolarized light scattering between 1 and 10~-4 GHz show mainly two contributions: a low frequency vibrational peak, the so-called Boson peak and a quasielastic component, referred to the beta _fast process in the mode coupling theory (MCT).
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