Publication detail

Viscosity and activation energy for viscous flow of PbO-WO3-P2O5 glasses

Year: 2013

Type of publication: článek v odborném periodiku

Name of source: Physics and Chemistry of Glasses: European Journal of Glass Science and Technology Part B

Publisher name: Society of Glass Technology

Place: Sheffield

Page from-to: 129-132

Titles:

Language	Name	Abstract	Keywords
cze	Viskozita a aktivační energie viskózního toku skel systému PbO-WO3-P2O5	Byla studována viskozita a aktivační energie viskózního toku skel systému PbO-WO3-P2O5. Získané výsledky byly korelovány se strukturou skel.	fosforečnanová skla; viskozita; viskózní tok; aktivační energie
eng	Viscosity and activation energy for viscous flow of PbO-WO3-P2O5 glasses	The temperature dependence of viscosity of three compositional series of PbO-WO3-P2O5 glasses with compositions (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, 0.5, 0.6; 0.5PbO center dot xWO(3)center dot(0.5-x)P2O5, x=0.1, 0.2, 0.3; and (0.5-x)PbO. xWO(3)center dot 0.5P(2)O(5), x=0.1, 0.2, 0.3, 04 measured by thermomechanical analysis is reported. The Andrade viscosity equation was successfully used to describe the temperature dependence of viscosity and to evaluate of the temperature independent activation energy for viscous flow. The results are discussed in terms of the glass structure by considering the network forming/modifying function of individual oxides. A simplified structural model is proposed and verified by a multilinear regression analysis of the compositional dependence of the activation energy for viscous flow and the glass transition temperature.	phosphate glasses; viscosity; viscous flow; activation energy

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