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Thermo-optic coefficient in some hybrid organic/inorganic fast sol–gel glasses

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Title: Thermo-optic coefficient in some hybrid organic/inorganic fast sol–gel glasses
Authors: Pokrass, M.1, Burshtein, Z.2, Gvishi, R.1 rgvishi@soreq.gov.il
Source: Optical Materials. Jul2010, Vol. 32 Issue 9, p975-981. 7p.
Subjects: Organic compounds, Thermal properties, Optical properties, Glass-ceramics, Methyl groups, Silica, Reflectance, Temperature effect, Thermal expansion
Abstract: Abstract: We have investigated the effect of organic content in hybrid organic/inorganic glasses prepared by the sol–gel process on the thermo-optic coefficient dn/dT. The organic phase consisted of homogeneously dispersed methyl groups within an inorganic silica matrix. Analysis of Fresnel reflectance temperature dependence of an optically polished sample-surface yielded the desired value, with an accuracy of 10−5/°C. A negative linear dependence of the thermo-optic coefficient on the volumetric thermal expansion coefficient β was obtained, dn/dT[10−4/°C]=−1.1–0.45β[10−4/°C]. Using Prod’homme’s model, a negative value was derived for the electronic polarizability coefficient Φ =(−1.8±0.3)×10−4/°C. The negative sign of Φ is attributed to isolation of the silica matrix sections by the methyl groups, causing the sections to distance upon increase in temperature. [Copyright &y& Elsevier]
Copyright of Optical Materials 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
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DbLabel: Engineering Source
An: 51807504
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PubTypeId: academicJournal
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  Data: Thermo-optic coefficient in some hybrid organic/inorganic fast sol–gel glasses
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  Data: <searchLink fieldCode="AR" term="%22Pokrass%2C+M%2E%22">Pokrass, M.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Burshtein%2C+Z%2E%22">Burshtein, Z.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Gvishi%2C+R%2E%22">Gvishi, R.</searchLink><relatesTo>1</relatesTo><i> rgvishi@soreq.gov.il</i>
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  Data: <searchLink fieldCode="JN" term="%22Optical+Materials%22">Optical Materials</searchLink>. Jul2010, Vol. 32 Issue 9, p975-981. 7p.
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  Data: <searchLink fieldCode="DE" term="%22Organic+compounds%22">Organic compounds</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+properties%22">Thermal properties</searchLink><br /><searchLink fieldCode="DE" term="%22Optical+properties%22">Optical properties</searchLink><br /><searchLink fieldCode="DE" term="%22Glass-ceramics%22">Glass-ceramics</searchLink><br /><searchLink fieldCode="DE" term="%22Methyl+groups%22">Methyl groups</searchLink><br /><searchLink fieldCode="DE" term="%22Silica%22">Silica</searchLink><br /><searchLink fieldCode="DE" term="%22Reflectance%22">Reflectance</searchLink><br /><searchLink fieldCode="DE" term="%22Temperature+effect%22">Temperature effect</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+expansion%22">Thermal expansion</searchLink>
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  Data: Abstract: We have investigated the effect of organic content in hybrid organic/inorganic glasses prepared by the sol–gel process on the thermo-optic coefficient dn/dT. The organic phase consisted of homogeneously dispersed methyl groups within an inorganic silica matrix. Analysis of Fresnel reflectance temperature dependence of an optically polished sample-surface yielded the desired value, with an accuracy of 10−5/°C. A negative linear dependence of the thermo-optic coefficient on the volumetric thermal expansion coefficient β was obtained, dn/dT[10−4/°C]=−1.1–0.45β[10−4/°C]. Using Prod’homme’s model, a negative value was derived for the electronic polarizability coefficient Φ =(−1.8±0.3)×10−4/°C. The negative sign of Φ is attributed to isolation of the silica matrix sections by the methyl groups, causing the sections to distance upon increase in temperature. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Optical Materials 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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        Value: 10.1016/j.optmat.2010.01.038
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      – Code: eng
        Text: English
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        Type: general
      – SubjectFull: Thermal properties
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      – SubjectFull: Optical properties
        Type: general
      – SubjectFull: Glass-ceramics
        Type: general
      – SubjectFull: Methyl groups
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      – SubjectFull: Silica
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      – SubjectFull: Reflectance
        Type: general
      – SubjectFull: Temperature effect
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      – SubjectFull: Thermal expansion
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      – TitleFull: Thermo-optic coefficient in some hybrid organic/inorganic fast sol–gel glasses
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            NameFull: Pokrass, M.
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            NameFull: Burshtein, Z.
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            NameFull: Gvishi, R.
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              M: 07
              Text: Jul2010
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              Y: 2010
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