Publikace detail

Structural relaxation of PbO-WO3-P2O5 glasses

Autoři: Chromčíková Mária | Liška Marek | Lissová Magdalena | Mošner Petr | Koudelka Ladislav

Rok: 2013

Druh publikace: článek v odborném periodiku

Název zdroje: Journal of Thermal Analysis and Calorimetry

Název nakladatele: Springer

Strana od-do: 947-954

Tituly:

Jazyk	Název	Abstrakt	Klíčová slova
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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