Vitrum Laugaricio (VILA) – Joint Glass Center of the Institute of Inorganic Chemistry SAS, A. Dubček University of Trenčín, Faculty of Chemical and Food Technology, Slovak Technical University, and RONA, j.s.c. Lednické Rovne, Študentská 2, 911 50, Trenčín, Slovak Republic
Institute of Physics AS CR, Cukrovarnická 10, 162 00, Praha 6, Czech Republic
Structural relaxation of scintillating Ce-doped Na–Gd phosphate glass with a nominal composition of Ce:NaGd(PO3)4 was experimentally studied using non-isothermal thermo-mechanical analysis, and the relaxation process was described by the Tool–Narayanaswamy–Mazurin model. The distribution of relaxation times was expressed by the empirical Kohlrausch–Williams–Watts relaxation function with relaxation time directly proportional to dynamic viscosity. The model parameters and material constants were obtained by the nonlinear regression analysis of thermo-mechanical data. It has been concluded that the model used of structural relaxation correctly describes relaxation processes in studied Ce-doped NaGd(PO3)4 glass.
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