The Journal of Physical Chemistry B· 2026Q1
Observation of Bridging Chlorine in Vitreous SiO2
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- 2026year
Short summary
Chlorine atoms in vitreous silica (v-SiO2) form bridging bonds between silica tetrahedra, preserving network connectivity and increasing stiffness, unlike fluorine which forms terminal Si-F groups.
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Key points
- Chlorine in vitreous silica forms bridging bonds between silica tetrahedra.
- Bridging chlorine preserves network connectivity, unlike terminal Si-F bonds from fluorine.
- Cl-doped v-SiO2 exhibits increased elastic stiffness and viscosity.
- The effect on density per mol % dopant is similar for Cl and F.
AI-generated from the title and abstract; the full text is not read.
Abstract
Abstract The short-range to mid-range structure of inorganic glasses profoundly impacts their physical properties. In this work, we have used multiple spectroscopic methods to examine the change in the network structure of amorphous silica with addition of Cl. Unlike analogous F-doped silicas, where the bonding of halogen leads to terminal Si–F groups, NMR and Raman data for Cl-doped v-SiO2 indicate bridging between silica tetrahedra, preserving rather than reducing network connectivity and contributing to their elastic stiffness and viscosity behaviors. These bridging Cl atoms make v-SiO2 stiffer while having the same effect on density behavior per mol % dopant as F in v-SiO2 and thus may be a desirable attribute in tailoring v-SiO2 for optical applications.
The authors' abstract, as published at the source. The Journal of Physical Chemistry B, 2026 · DOI ↗
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Field: Ceramics and Composites
Ceramics and CompositesMaterials Science