The viscosity of Na2O-CaO-Al2O3-SiO2 melts

Webb, Sharon L.; Banaszak, M.; Köhler, U.; Rausch, Svenja; Raschke, Gerrit

doi:10.1127/0935-1221/2007/0019-1765

Cited by 28 publications

(22 citation statements)

References 23 publications

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“…It was not possible to quantify the thickness of the impurity layer in the EGI, but the relatively short time of sputtering required to remove the layer indicates that the layer thickness is to be measured in the order of monolayers [14]. Subtle differences in the chemical composition of glass phases, such the Na content, will affect the viscosity [15]. Since ToF-SIMS is not a quantitative method the exact chemical compositions of the detected impurity layers of the EGI is not known.…”

Section: Discussionmentioning

confidence: 99%

Characterisation of the Ni/ScYSZ interface in a model solid oxide fuel cell anode

2008

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Section: Discussionmentioning

confidence: 99%

Characterisation of the Ni/ScYSZ interface in a model solid oxide fuel cell anode

2008

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“…All the investigated melts are metaluminous defined by (Shand 1927). An estimation of the degree of depolymerisation and hence of the melt structure is γ = (Na (Toplis et al 1997;Webb et al 2007) which ranges from 0.55 for WPVe to 0.72 for PR-Fe and PR-Leu. The γ values are given in Table 1.…”

Section: Resultsmentioning

confidence: 99%

Rheology of melts from the colli albani volcanic district (Italy): a case study

Kleest

Webb

Fanara

2020

Contrib Mineral Petrol

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In this study the first viscosity measurements in the glass transition range of melts from highly explosive large-volume eruptions from the Colli Albani Volcanic District (CAVD) are presented. The magmas are ultrapotassic, rich in iron and CaO and characterised by a low silica content (< 45 wt%). Melt compositions range from tephri-phonolitic to foiditic. The Colli Albani eruptions appear anomalous since they produced a large volume of erupted material in spite of their silica undersaturated compositions. The viscosity of the Colli Albani melt changes as the melt composition evolves from the original melt to a country-rock contaminated melt to a crystal-bearing melt with a permanent decrease in liquid viscosity. Conventional estimations of viscosities assume these magmas to have a low viscosity. The presented data show that the melt viscosities are higher than expected. Taking into account further chemical or rheological features of a melt, the investigated CAVD melts are not that striking as assumed in comparison with other large-volume eruptions. Consequently, considering the alkaline-earth to alkaline ratio together with the SiO2 content could provide an alternative when comparing large volume eruptions.

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“…The mechanism of flow in silicate liquids controls their viscosity. The basic flow mechanism is believed to be the exchange of Si–O bonds, but modification in the liquid composition creates different pre‐ and post‐Si–O bond exchange structures, which have varying bond energies, time scales and probabilities . In sodium silicate liquids, the viscous flow involves several processes: (a) breaking Na–O bond; (b) creating a fivefold coordinated silicon (Si V ) by using the free O‐bond; (c) rupturing the Si V coordination to produce a new free O‐bond; and (d) creating a new Na–O bond .…”

Section: Resultsmentioning

confidence: 99%

Viscosity and Fragility of Alkaline‐Earth Sodium Boroaluminosilicate Liquids

Smedskjær

Potužák

2013

J. Am. Ceram. Soc.

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Understanding the composition and temperature dependence of viscosity of silicate liquids is of the highest importance not only for geological processes but also for production of industrial glass. In this work, we have determined the temperature dependence of equilibrium liquid viscosity of 36 alkaline-earth sodium boroaluminosilicate liquids as a function of the Si/Al ratio and the type of alkaline-earth oxide (MgO, CaO, SrO, or BaO). We demonstrate that the isokom temperature at 10 12 Pa s (i.e., the glass transition temperature) generally increases with increasing Si/Al ratio, whereas the isokom temperatures at 10 4 and 10 1.5 Pa s exhibit a decrease with increasing [Al 2 O 3 ] in the peraluminous regime. The isokom temperatures decrease with increasing alkaline-earth size in the peralkaline regime, whereas they increase with increasing alkaline-earth size in the peraluminous regime. The liquid fragility index m exhibits a minimum value at an intermediate Si/Al ratio, with the position of the minimum increasing to a higher value of [Al 2 O 3 ] with increasing alkaline-earth size. We have discussed our findings in terms of the underlying structural and topological changes as a function of composition and temperature.

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The viscosity of Na2O-CaO-Al2O3-SiO2 melts

Cited by 28 publications

References 23 publications

Characterisation of the Ni/ScYSZ interface in a model solid oxide fuel cell anode

Characterisation of the Ni/ScYSZ interface in a model solid oxide fuel cell anode

Rheology of melts from the colli albani volcanic district (Italy): a case study

Viscosity and Fragility of Alkaline‐Earth Sodium Boroaluminosilicate Liquids

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