Viscoelastic properties of Na–Al–PO3 glasses and melts

摘要: Elastic and relaxational properties of (NaPO3)(1−x)(Al(PO3)3)x melts glasses have been studied for x=0, 0.03, 0.06, 0.15, 0.60, T=293–1433 K. Brillouin light scattering as well ultrasound were used. The data carefully analyzed using viscoelastic theory, with emphasis on the effect added Al(PO3)3, searching a fast relaxation channel (besides α-relaxation common to glass formers). process is present x⩾0.03, T-dependence relative weight both processes in derived. replacement Na+ by Al3+ increases high-frequency LA sound velocity drastically, due twofold increase shear modulus. Comparison viscosity made. Viscosity thermodynamic are used deriving an estimate size regions active slow process. Possible origins discussed.