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Structural relaxation of PbO-WO3-P2O5 glasses
Authors: Chromčíková Mária | Liška Marek | Lissová Magdalena | Mošner Petr | Koudelka Ladislav
Year: 2013
Type of publication: článek v odborném periodiku
Name of source: Journal of Thermal Analysis and Calorimetry
Publisher name: Springer
Page from-to: 947-954
Titles:
Language Name Abstract Keywords
cze Strukturní relaxace skel systému PbO-WO3-P2O5 Pomocí termomechanické analýzy byla studována strukturní relaxace skel systému PbO-WO3-P2O5 v oblasti skelného přechodu. Získaná relaxační data byla popsána s využitím teoretických modelů Tool-Narayanaswamy-Moynihan a Tool-Narayanaswamy-Mazurin. fosforečnanová skla; strukturní relaxace; viskozita; skelný přechod
eng Structural relaxation of PbO-WO3-P2O5 glasses The structural relaxation of three compositional series of PbO-WO3-P2O5 glasses with composition (0.5 - x/2)PbO center dot xWO(3)center dot(0.5 - x/2)P2O5, x = 0, 0.1, 0.2, 0.3, 0.4, and 0.5; 0.5PbO center dot xWO(3)center dot(0.5 - x)P2O5, x = 0, 0.1, 0.2, and 0.3; and (0.5 - x)PbO center dot xWO(3)center dot 0.5P(2)O(5), x = 0, 0.1, 0.2, 0.3, 0.4, and 0.5 was studied by thermomechanical analysis. The structural relaxation was studied in the transformation region using the Tool-Narayanaswamy-Moynihan's and Tool-Narayanaswamy-Mazurin's models. The relaxation function of Kohlrausch Williams and Watts was used. The parameters of both models were calculated by nonlinear regression analysis of thermodilatometric curves measured by thermomechanical analyzer under the constant load. Both models very well describe the experimental data. 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. Both models possess the values of metastable melt thermal expansion coefficient equal to their experimental value. phosphate glasses; structural relaxation; viscosity; glass transition

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