Boroxol rings in SiO2–B2O3 glasses: Influence on low-temperature thermal properties
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| Title: | Boroxol rings in SiO |
|---|---|
| Authors: | Richet, Pascal richet@ipgp.jussieu.fr, Atake, Tooru1, Yamashita, Isao1 |
| Source: | Journal of Non-Crystalline Solids. Oct2006, Vol. 352 Issue 36/37, p3854-3858. 5p. |
| Subjects: | Temperature measurements, Thermal properties, Thermodynamics, Nonmetals |
| Abstract: | Abstract: The heat capacity of a rapidly quenched B2O3–SiO2 glass has been measured by adiabatic calorimetry from 10 to 350K. The vibrational entropy derived from the measurements, S 298–S 0 =54.16±0.10J/molK, is close to the linear trend defined by the entropies of pure SiO2 and B2O3 glasses. Owing to the strong sensitivity of S 298 − S 0 to the oxygen coordination of cations, this result is in agreement with the 3- and 4-fold coordination found for Si and B, respectively, in binary borosilicates. Because additivity of heat capacity extends below 90K, where the low-frequency modes of boroxol rings dominate the vibrational density of states, the results indicate also that the fraction of boron atoms in these rings is proportional to the B2O3 content. According to recent NMR evidence, these conclusions apply to truly homogenous glasses at a microscopic scale. [Copyright &y& Elsevier] |
| Copyright of Journal of Non-Crystalline Solids is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Boroxol rings in SiO<subscript>2</subscript>–B<subscript>2</subscript>O<subscript>3</subscript> glasses: Influence on low-temperature thermal properties – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Richet%2C+Pascal%22">Richet, Pascal</searchLink><i> richet@ipgp.jussieu.fr</i><br /><searchLink fieldCode="AR" term="%22Atake%2C+Tooru%22">Atake, Tooru</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Yamashita%2C+Isao%22">Yamashita, Isao</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Non-Crystalline+Solids%22">Journal of Non-Crystalline Solids</searchLink>. Oct2006, Vol. 352 Issue 36/37, p3854-3858. 5p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Temperature+measurements%22">Temperature measurements</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+properties%22">Thermal properties</searchLink><br /><searchLink fieldCode="DE" term="%22Thermodynamics%22">Thermodynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Nonmetals%22">Nonmetals</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Abstract: The heat capacity of a rapidly quenched B2O3–SiO2 glass has been measured by adiabatic calorimetry from 10 to 350K. The vibrational entropy derived from the measurements, S 298–S 0 =54.16±0.10J/molK, is close to the linear trend defined by the entropies of pure SiO2 and B2O3 glasses. Owing to the strong sensitivity of S 298 − S 0 to the oxygen coordination of cations, this result is in agreement with the 3- and 4-fold coordination found for Si and B, respectively, in binary borosilicates. Because additivity of heat capacity extends below 90K, where the low-frequency modes of boroxol rings dominate the vibrational density of states, the results indicate also that the fraction of boron atoms in these rings is proportional to the B2O3 content. According to recent NMR evidence, these conclusions apply to truly homogenous glasses at a microscopic scale. [Copyright &y& Elsevier] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Non-Crystalline Solids is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.jnoncrysol.2006.06.034 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 5 StartPage: 3854 Subjects: – SubjectFull: Temperature measurements Type: general – SubjectFull: Thermal properties Type: general – SubjectFull: Thermodynamics Type: general – SubjectFull: Nonmetals Type: general Titles: – TitleFull: Boroxol rings in SiO2–B2O3 glasses: Influence on low-temperature thermal properties Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Richet, Pascal – PersonEntity: Name: NameFull: Atake, Tooru – PersonEntity: Name: NameFull: Yamashita, Isao IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 10 Text: Oct2006 Type: published Y: 2006 Identifiers: – Type: issn-print Value: 00223093 Numbering: – Type: volume Value: 352 – Type: issue Value: 36/37 Titles: – TitleFull: Journal of Non-Crystalline Solids Type: main |
| ResultId | 1 |
