The structural relaxation of three compositional series of PbO-WO3-P2O5 glasses with.4, 0.5 was studied by thermomechanical analysis [1,2]. The relaxation was described using a mathematical model based on the stretched exponential relaxation function with relaxation time proportional to actual viscosity. The viscosity dependence on thermodynamic temperature and fictive temperature was expressed by Mazurin's approximation [3,4,5]. The relaxation parameters dependence on the glass composition was studied. It was found that the modulus is increasing with increasing amount of WO3 in all glasses. On the contrary, the width of the spectrum of relaxation times is decreasing with increasing amount of WO3 in all studied glasses.
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