Mixed alkaline earth effect in sodium aluminosilicate glasses

Jonas Kjeldsen, Morten Mattrup Smedskjær, John C. Mauro, Randall E. Youngman, Liping Huang, Yuanzheng Yue

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Resumé

While the mixed alkali effect has received significant attention in the glass literature, the mixed alkaline earth effect has not been thoroughly studied. Here, we investigate the latter effect by partial substitution of magnesium for calcium in sodium aluminosilicate glasses. We use Raman and NMR spectroscopies to obtain insights into the structural and topological features of these glasses, and hence into the mixed alkaline earth effect. We demonstrate that the mixed alkaline earth effect manifests itself as a maximum in the amount of bonded tetrahedral units and as a minimum in liquid fragility index, glass transition temperature, Vickers microhardness, and isokomtemperatures (viz., the temperatures atη=10^13.5 and 10^12.2 Pa s). The observed min-ima in fragility, glass transition temperature, and isokom temperature are ascribed to bond weakening in the local structural environment around the network modifiers. We suggest that, since the elastic properties of the investi-gated system are compositionally independent, the minimum in Vickers microhardness is closely correlated to the minimum in isokom temperatures. Both of these properties are related to plasticflow and the translational
motion of structural units, and hence both may be relatedto the same underlying topological constraints. This indicates that there might not be any significant difference in the onset of the rigid sub-Tgconstraints for the inves-tigated compositions.
OriginalsprogEngelsk
TidsskriftJournal of Non-Crystalline Solids
Vol/bind369
Sider (fra-til)61-68
Antal sider8
ISSN0022-3093
DOI
StatusUdgivet - 1 jun. 2013

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Aluminosilicates
Sodium
Earth (planet)
sodium
Glass
Microhardness
glass
microhardness
glass transition temperature
Alkalies
Temperature
Magnesium
Nuclear magnetic resonance spectroscopy
Raman spectroscopy
Calcium
Substitution reactions
Liquids
temperature
magnesium
calcium

Citer dette

Kjeldsen, Jonas ; Smedskjær, Morten Mattrup ; Mauro, John C. ; Youngman, Randall E. ; Huang, Liping ; Yue, Yuanzheng. / Mixed alkaline earth effect in sodium aluminosilicate glasses. I: Journal of Non-Crystalline Solids. 2013 ; Bind 369. s. 61-68.
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Mixed alkaline earth effect in sodium aluminosilicate glasses. / Kjeldsen, Jonas; Smedskjær, Morten Mattrup; Mauro, John C.; Youngman, Randall E.; Huang, Liping; Yue, Yuanzheng.

I: Journal of Non-Crystalline Solids, Bind 369, 01.06.2013, s. 61-68.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Mixed alkaline earth effect in sodium aluminosilicate glasses

AU - Kjeldsen, Jonas

AU - Smedskjær, Morten Mattrup

AU - Mauro, John C.

AU - Youngman, Randall E.

AU - Huang, Liping

AU - Yue, Yuanzheng

PY - 2013/6/1

Y1 - 2013/6/1

N2 - While the mixed alkali effect has received significant attention in the glass literature, the mixed alkaline earth effect has not been thoroughly studied. Here, we investigate the latter effect by partial substitution of magnesium for calcium in sodium aluminosilicate glasses. We use Raman and NMR spectroscopies to obtain insights into the structural and topological features of these glasses, and hence into the mixed alkaline earth effect. We demonstrate that the mixed alkaline earth effect manifests itself as a maximum in the amount of bonded tetrahedral units and as a minimum in liquid fragility index, glass transition temperature, Vickers microhardness, and isokomtemperatures (viz., the temperatures atη=10^13.5 and 10^12.2 Pa s). The observed min-ima in fragility, glass transition temperature, and isokom temperature are ascribed to bond weakening in the local structural environment around the network modifiers. We suggest that, since the elastic properties of the investi-gated system are compositionally independent, the minimum in Vickers microhardness is closely correlated to the minimum in isokom temperatures. Both of these properties are related to plasticflow and the translationalmotion of structural units, and hence both may be relatedto the same underlying topological constraints. This indicates that there might not be any significant difference in the onset of the rigid sub-Tgconstraints for the inves-tigated compositions.

AB - While the mixed alkali effect has received significant attention in the glass literature, the mixed alkaline earth effect has not been thoroughly studied. Here, we investigate the latter effect by partial substitution of magnesium for calcium in sodium aluminosilicate glasses. We use Raman and NMR spectroscopies to obtain insights into the structural and topological features of these glasses, and hence into the mixed alkaline earth effect. We demonstrate that the mixed alkaline earth effect manifests itself as a maximum in the amount of bonded tetrahedral units and as a minimum in liquid fragility index, glass transition temperature, Vickers microhardness, and isokomtemperatures (viz., the temperatures atη=10^13.5 and 10^12.2 Pa s). The observed min-ima in fragility, glass transition temperature, and isokom temperature are ascribed to bond weakening in the local structural environment around the network modifiers. We suggest that, since the elastic properties of the investi-gated system are compositionally independent, the minimum in Vickers microhardness is closely correlated to the minimum in isokom temperatures. Both of these properties are related to plasticflow and the translationalmotion of structural units, and hence both may be relatedto the same underlying topological constraints. This indicates that there might not be any significant difference in the onset of the rigid sub-Tgconstraints for the inves-tigated compositions.

KW - Aluminosilicate glasses; Mixed alkaline earth effect; Hardness; Viscosity; Dynamic structure model

KW - Viscosity

KW - Hardness

KW - Mixed alkaline earth effect

KW - Aluminosilicate glasses

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DO - 10.1016/j.jnoncrysol.2013.03.015

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EP - 68

JO - Journal of Non-Crystalline Solids

JF - Journal of Non-Crystalline Solids

SN - 0022-3093

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