Effect of chemical composition on viscosity of oxide glasses

Effect of chemical composition on viscosity of oxide glasses

The dependence of viscosity on composition of silicate melts is described by means of a structure based model. It distinguishes between network forming oxides, such as SiO 2, and network modifying ones, such as Na 2O. The structural assumption is that there are two different types of bonds in the sy...

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Veröffentlicht in:Journal of non-crystalline solids 2003-08, Vol.324 (1), p.29-35
Hauptverfasser: Avramov, I., Rüssel, C., Keding, R.
Format: Artikel
Sprache:eng
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Condensed matter: structure, mechanical and thermal properties
Diffusive momentum transport (including viscosity of liquids)
Exact sciences and technology
Physics
Transport properties of condensed matter (nonelectronic)
Viscosity of liquids
diffusive momentum transport
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creator Avramov, I.
Rüssel, C.
Keding, R.
description The dependence of viscosity on composition of silicate melts is described by means of a structure based model. It distinguishes between network forming oxides, such as SiO 2, and network modifying ones, such as Na 2O. The structural assumption is that there are two different types of bonds in the system: rigid ones like Si–O–Si and floppy bonds like Si–O −Na +. The activation energy for shear viscosity is reduced in the presence of floppy bonds. Therefore, even low concentrations of modifying oxides reduce considerably the viscosity of the melt, a lubricant effect.
doi_str_mv 10.1016/S0022-3093(03)00230-8
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source ScienceDirect Journals (5 years ago - present)
subjects Condensed matter: structure, mechanical and thermal properties
Diffusive momentum transport (including viscosity of liquids)
Exact sciences and technology
Physics
Transport properties of condensed matter (nonelectronic)
Viscosity of liquids
diffusive momentum transport
title Effect of chemical composition on viscosity of oxide glasses
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