The interstitial structure of vitreous silica

Shackelford, James F.; Masaryk, Joseph S.

doi:10.1016/0022-3093(78)90061-3

Cited by 87 publications

(56 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The solubility of more than 1.0 mol per mole of SiO 2 glass at 10 GPa cannot be explained by the conventional model on void-size distribution 8 . The radius of helium at 10 GPa is calculated to be 1.1 Å, assuming that a helium atom is a hard sphere and in a close-packed configuration under high pressure [28][29][30] .…”

Section: Resultsmentioning

confidence: 87%

“…A model on the distribution of the size of interstitial void sites in SiO 2 glass has been proposed based on its similarity to cristobalite in interstitial structure 8,26,27 . According to this model, the distribution of void size is log-normal, and the total number of void sites is 2.22×10 22 cm − 3 , that is, 1.00 mol per mole of SiO 2 glass.…”

Section: Resultsmentioning

confidence: 99%

“…It may be appropriate to consider that helium atoms are continuously stacked in three-dimensionally connected voids, because voids in SiO 2 glass may not be isolated 8 . A total effective volume of voids, which can be occupied by helium atoms, is roughly estimated as follows.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, new phases may be synthesized at high pressures and/or recovered to ambient pressure. For example, cristobalite is highly likely to transform to a new structure, because it has a structure similar to SiO 2 glass 1,8,26,27 . On the basis of this assumption, we have recently compressed cristobalite in a helium medium and observed a new phase at 10 GPa, which shows diffraction peaks at larger d values.…”

Section: Discussionmentioning

confidence: 99%

“…SiO 2 glass is compressible among silicates (or oxides) [4][5][6][7] because it has a structure with a significant amount of interstitial voids 8 . Elastic softening and permanent densification of SiO 2 glass under high pressure are interesting issues in physics and materials science [4][5][6][9][10][11][12] and closely related to deformation and compaction of these voids.…”

mentioning

confidence: 99%

See 4 more Smart Citations

Helium penetrates into silica glass and reduces its compressibility

2011

View full text Add to dashboard Cite

SiO 2 glass has a network structure with a significant amount of interstitial voids. Gas solubilities in silicates are expected to become small under high pressure due to compaction of voids. Here we show anomalous behaviour of SiO 2 glass in helium. Volume measurements clarify that SiO 2 glass is much less compressible than normal when compressed in helium, and the volume in helium at 10 GPa is close to the normal volume at 2 GPa. X-ray diffraction and Raman scattering measurements suggest that voids are prevented from contracting when compressed in helium because helium penetrates into them. The estimated helium solubility is very high and is between 1.0 and 2.3 mol per mole of SiO 2 glass at 10 GPa, which shows marked contrast with previous models. These results may have implications for discussions of the Earth's evolution as well as interpretations of various high-pressure experiments, and also lead to the creation of new materials.

show abstract

Section: Resultsmentioning

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Helium penetrates into silica glass and reduces its compressibility

2011

View full text Add to dashboard Cite

show abstract

High Molecular Permeance in a Poreless Ceramic Membrane

Gu¹,

Oyama²

2007

Advanced Materials

View full text Add to dashboard Cite

Solubility of gases in glass melts

Krämer

1996

Ber Bunsenges Phys Chem

View full text Add to dashboard Cite

A short overview on gas solubility and solubility mechanism in oxide melts in given. Many gases of practical importance in glass melting like oxygen, nitrogen, carbon dioxide and sulfur dioxide and others dissolve in a glass forming melt both chemically by a chemical controlled process and physically by occupying the holes in the network structure. The chemical solubility at conditioning temperatures is orders of magnitude higher than the physical solubility and decreases with increasing temperatures. An exception is water whose chemical solubility increases with increasing temperature, and that is why water cannot be used as a fining agent. The physical solubility on the other hand increases slightly with increasing temperatures. At measuring physical solubilities mistakes can be made because of the omnipresent chemical solubility or because of impurities. Therefore the known relationship between physical inert gas solubilities and the size of the dissolving atoms or molecules was used to calculate the physical solubility of a lot of non-inert gases for soda-lime silica melts, for fused silica and for molten boric oxide.

show abstract

The interstitial structure of vitreous silica

Cited by 87 publications

References 8 publications

Helium penetrates into silica glass and reduces its compressibility

Helium penetrates into silica glass and reduces its compressibility

High Molecular Permeance in a Poreless Ceramic Membrane

Solubility of gases in glass melts

Contact Info

Product

Resources

About