Effect of alumina on enthalpy of mixing of mixed alkali silicate glasses

Lezzi, Peter J.; Tomozawa, M.

doi:10.1016/j.jnoncrysol.2010.12.074

Cited by 9 publications

(12 citation statements)

References 24 publications

(63 reference statements)

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“…Tomozawa and co-workers ,, found that mixed alkali glasses have large negative enthalpies of mixing, which may be explained by strong alkali–alkali interactions and local ordering. This is consistent with the observed radius effects.…”

Section: Introductionmentioning

confidence: 98%

“…Mixed-alkali glasses also show deviations in mechanical properties. , Of particular modern importance due to the recent popularity of ion-exchanged glass products (some, e.g., , even utilizing ion exchange to examine the MAE itself), the hardness of mixed-alkali glasses has been shown to exhibit a moderate positive MAE. ,, …”

Section: Introductionmentioning

confidence: 99%

“…This is consistent with the observed radius effects. Stress formed in ion-exchanged glass alters this enthalpy of mixing, and may induce ordering in the glass. , The addition of alumina to mixed-alkali glasses effectively reduces the prevalence of alkali–alkali interactions since alkali ions are “consumed” by charge compensating aluminum ions …”

Section: Introductionmentioning

confidence: 99%

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Topological Origins of the Mixed Alkali Effect in Glass

et al. 2019

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The mixed alkali effect, the deviation from expected linear property changes when alkali ions are mixed in a glass, remains a point of contention in the glass community. While several earlier models have been proposed to explain mixed alkali effects on ionic motion, models based on or containing discussion of structural aspects of mixed-alkali glasses remain rare by comparison. However, the transition-range viscosity depression effect is many orders in magnitude for mixed-alkali glasses, and the original observation of the effect (then known as the Thermometer Effect) concerned the highly anomalous temperature dependence of stress and structural relaxation time constants. With this in mind, a new structural model based on topological constraint theory is proposed herein which elucidates the origin of the mixed alkali effect as a consequence of network strain due to differing cation radii. Discussion of literature models and data alongside new molecular dynamics simulations and experimental data are presented in support of the model, with good agreement.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Topological Origins of the Mixed Alkali Effect in Glass

et al. 2019

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“…A source for mullite in porcelain may come from the dissolution of alumina or alumina precursors saturating the porcelain glassy phase. The dissolution of alumina in alkali silicate glasses (Na 2 O and K 2 O) has been studied in the literature [6] by measuring the reduction of the magnitude of the enthalpy of mixing alkali silicates with alumina addition and has been attributed to the reduction of the glass nonbridging oxygen content. The aim of the present work was to study the role of the mullite phase on the mechanical properties of commercial porcelain stoneware and analyzing the resulting microstructure after systematically adding 2, 5, and 10 wt% pseudoboehmite.…”

Section: Introductionmentioning

confidence: 99%

Increasing Bending Strength of Porcelain Stoneware via Pseudoboehmite Additions

Aguilar-García

Lara-Hernández

Arellano-Lara

et al. 2014

Journal of Ceramics

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Pseudoboehmite nanoparticles synthesized through the desulfation of Al2(SO4)3 were used to investigate the reinforcement of commercial porcelain stoneware. Fractured specimens investigated by SEM suggest that the added pseudoboehmite precursor generated a nanometric primary mullite phase dispersed in the porcelain glassy phase that limited and stopped the intergranular crack propagation. The porcelain modulus of rupture increased twice the value of the modulus of rupture (108 MPa) as compared with that samples without pseudoboehmite additions. Pseudoboehmite also led to increased densification of porcelain stoneware bodies up to 1250°C as shown by thermodilatometry data.

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“…Since the oxygen atom supplied by the R + or R 2+ is utilised as a bridging oxygen upon the addition of aluminium ions, it cannot be a NBO. Hence, for every one atom of aluminium one NBO is removed from the network, increasing network connectivity and chemical durability [149,150]. The second reason the R + and R 2+ ions need to be in excess for tetrahedral Al 3+ ions to occur is to balance the local charge, as the effective charge for the AlO2 tetrahedra is -1 distributed over the anion which is balanced by either one R + or two R 2+ cations, demonstrated in Equation 2.…”

Section: Minor Additives For Sls Glass 22251 Al 3+mentioning

confidence: 99%

Effects of d0 and s2 cations on optical properties of silicate glasses

Allsopp¹

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In partial fulfilment of its requirements for The Degree of Doctor of Philosophy 2 Declaration I hereby declare, that the thesis entitled 'Effects of d 0 and s 2 cations on optical properties of silicate glasses' is a result of my original work and investigation. None of the results presented in the manuscript have been lifted from any other sources and legitimate references are presented where necessary. Name:Signature:The copyright of this thesis rests with the author and no quotations from it or information derived from it may be published without prior written consent of the author. 3 Published work and conferences Aspects of the work described in the thesis were published in:• Optical and structural properties of d 0 ion doped silicate glasses for photovoltaic applications. B.

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Effect of alumina on enthalpy of mixing of mixed alkali silicate glasses

Cited by 9 publications

References 24 publications

Topological Origins of the Mixed Alkali Effect in Glass

Topological Origins of the Mixed Alkali Effect in Glass

Increasing Bending Strength of Porcelain Stoneware via Pseudoboehmite Additions

Effects of d0 and s2 cations on optical properties of silicate glasses

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