Viscosity of silica glass prepared from sol–gel powder

Yamahara, Keiji; Shima, Kunihisa; Utsunomiya, Akira; Tsurita, Yasushi

doi:10.1016/j.jnoncrysol.2004.08.204

Cited by 12 publications

(11 citation statements)

References 10 publications

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“…Thus, the presence of a small amount of aluminum could increase the viscosity of Al-doped silica melts since it enhances the Si-O bond strength. The increase of the viscosity of silica with the aluminum content was observed in previous studies 7 , in which the aluminum concentration was in the ppm level. A higher amount of aluminum will result in the destruction of the silica network and the deterioration of the Si-O bond strength, resulting in a lower viscosity of the silicate melts.…”

Section: Discussionsupporting

confidence: 74%

“…It even showed a lower weight loss by water corrosion than mullite ceramics that have very high aluminum content. Besides, the experimental results indicated that the viscosity of silica increases with the aluminum content when the aluminum concentration is in the ppm level 7 . The measured silica activities in aluminum silicate melts were also very low when the silica contained only small amounts of aluminum, even lower than the silica activities of mullite with an aluminum content of 75 at% 16 .…”

mentioning

confidence: 94%

“…Therefore, the properties and behavior of metastable, amorphous and stable silicon oxides are of fundamental interest in the geosciences 1 , microelectronics 2 , ceramics industry 3 , and materials science 4 . However, their practical application is often limited by impurities that can drastically change their mechanical, electrical 5 , and viscous properties 6 7 . Impurities, e.g., alkali metals 8 or hydrogen 9 , have been demonstrated to be able to significantly affect the properties of silicon oxides.…”

mentioning

confidence: 99%

“…Aluminum impurities are known to significantly affect the properties of silicon oxides, such as the viscosity of silicates 7 , the corrosion resistance 10 11 12 , and the molecular diffusion of oxygen 13 14 15 . It is generally believed that aluminum atoms can disturb the silica network, thereby decreasing the viscosity of silica and enhancing the molecular diffusion of oxygen.…”

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confidence: 99%

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Abnormal behavior of silica doped with small amounts of aluminum

Liu

Wang

2016

Sci Rep

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Silica is the most abundant mineral in the crust of the Earth. It has been demonstrated that the aluminum concentration in silica plays a key role in determining many properties of silica-based components. Although the alumina-silica system has been intensely studied, the effect of very small amounts of aluminum on the structure and properties of silica remains unclear. We report results of first principles calculations showing that small amounts of aluminum could be metastable when located in the center of Si-O rings without breaking the silica network. In contrast, higher aluminum contents will result in the destruction of the Si-O bonds, leading to the formation of triclusters and a 4-, 5-, and 6-fold Al-O coordination, as observed in previous studies. Based on the silica structure obtained through geometric optimization, the properties of silica doped with small amounts of aluminum were calculated. The results can account for many ‘abnormal’ phenomena experimentally observed. The results benefit most areas such as geosciences, microelectronics, glass industry, and ceramic materials.

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Section: Discussionsupporting

confidence: 74%

mentioning

confidence: 94%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Abnormal behavior of silica doped with small amounts of aluminum

Liu

Wang

2016

Sci Rep

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“…Technically, viscous flow of glass needs to be measured in a way quite different from those adopted in cases of measurements of normal viscous liquids. For example, we can find recent works which report viscous flow measurements of glass [1,[11][12][13]. In order to use temperature-dependent viscous flow of phenyl glass as a quantitative measure, the activation energy should be obtained by the Arrhenius plot as seen in previous works [14,15].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of activation energy of viscous flow of sol–gel derived phenyl-modified silica glass

Kamimura

Kurumada

Asaba

et al. 2006

Journal of Non-Crystalline Solids

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Bifunctional Al Dopant for Enhancing Bulk and Grain Boundary Conductivities in Sodium Ion Conducting NASICON Ceramics

Xun,

Wang,

Sato

et al. 2024

Advanced Energy Materials

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Compared to Li+ and Na+ ion‐conducting sulfides with conductivities of ≈10⁻2 S cm⁻1 at room temperature, oxide ceramics typically exhibit conductivities an order of magnitude lower, rendering them less attractive as electrolytes for all‐solid‐state batteries (ASSBs). This study presents NASICON‐based electrolyte, achieving a remarkable conductivity of 6.0 × 10⁻3 S cm⁻1 at room temperature, rivaling that of sulfide‐based electrolytes. This is accomplished by optimizing the composition in the range Na3+x+yZr2−yAlySi2+xP1−xO12 (0.10 ≤ x ≤ 0.50, 0 ≤ y ≤ 0.1). Despite the issue of reduced sinterability with increasing Si/P ratio due to the formation of a viscous SiO2‐rich grain boundary interphase, the addition of Al2O3 effectively reduces the viscosity and improves the sinterability. In other words, a strategy of engineering the liquid phase that is in situ generated from the host phase is viable. The enhanced conductivity is attributed not only to the lowered grain boundary resistivity but also to lattice expansion from modified Na occupations in the crystal structure. Furthermore, this material demonstrates a wide electrochemical window, suppressed partial electronic conductivity, low polarization voltage in direct contact with a Na anode, and charge‐discharge cycles with minimal polarization when directly interfaced with a NASICON‐type cathode, repositioning it as a promising electrolyte for ceramic ASSBs.

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Viscosity of silica glass prepared from sol–gel powder

Cited by 12 publications

References 10 publications

Abnormal behavior of silica doped with small amounts of aluminum

Abnormal behavior of silica doped with small amounts of aluminum

Evaluation of activation energy of viscous flow of sol–gel derived phenyl-modified silica glass

Bifunctional Al Dopant for Enhancing Bulk and Grain Boundary Conductivities in Sodium Ion Conducting NASICON Ceramics

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