High-temperature crystal chemistry of α-Na2B4O7 and β-NaB3O5 layered borates.
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| Title: | High-temperature crystal chemistry of α-Na |
|---|---|
| Authors: | N. Sennova1, R. Bubnova2, S. Filatov1, I. Polyakova2 |
| Source: | Glass Physics & Chemistry. Jun2007, Vol. 33 Issue 3, p217-225. 9p. |
| Subjects: | Thermal expansion, Anisotropy, X-ray diffraction, Borates |
| Abstract: | Abstract The thermal expansion of two layered sodium borates is investigated using high-temperature X-ray powder diffraction. It is established that both compounds are characterized by strong anisotropy of thermal expansion due to the hinge mechanism. Special (singular) points are revealed in the temperature dependences of the angular lattice parameters for the α-Na2B4O7 compound. The temperature of manifestation of these singularities corresponds to the glass transition temperature of the melt of the same chemical composition. The assumption is made that the angular lattice parameters (angles between atomic rows) in compounds with a considerable degree of ionic bonding are more sensitive to variations in temperature as compared to the linear lattice parameters (interatomic distances). It is experimentally in situ demonstrated with high-temperature X-ray diffraction that the β-NaB3O5 borate is peritectically melted at a temperature of 725 10C with the formation of the α-Na2B8O13 octaborate. [ABSTRACT FROM AUTHOR] |
| Copyright of Glass Physics & Chemistry is the property of Springer Nature 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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| Items | – Name: Title Label: Title Group: Ti Data: High-temperature crystal chemistry of α-Na<subscript>2</subscript>B<subscript>4</subscript>O<subscript>7</subscript> and β-NaB<subscript>3</subscript>O<subscript>5</subscript> layered borates. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22N%2E+Sennova%22">N. Sennova</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22R%2E+Bubnova%22">R. Bubnova</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22S%2E+Filatov%22">S. Filatov</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22I%2E+Polyakova%22">I. Polyakova</searchLink><relatesTo>2</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Glass+Physics+%26+Chemistry%22">Glass Physics & Chemistry</searchLink>. Jun2007, Vol. 33 Issue 3, p217-225. 9p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Thermal+expansion%22">Thermal expansion</searchLink><br /><searchLink fieldCode="DE" term="%22Anisotropy%22">Anisotropy</searchLink><br /><searchLink fieldCode="DE" term="%22X-ray+diffraction%22">X-ray diffraction</searchLink><br /><searchLink fieldCode="DE" term="%22Borates%22">Borates</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Abstract  The thermal expansion of two layered sodium borates is investigated using high-temperature X-ray powder diffraction. It is established that both compounds are characterized by strong anisotropy of thermal expansion due to the hinge mechanism. Special (singular) points are revealed in the temperature dependences of the angular lattice parameters for the α-Na2B4O7 compound. The temperature of manifestation of these singularities corresponds to the glass transition temperature of the melt of the same chemical composition. The assumption is made that the angular lattice parameters (angles between atomic rows) in compounds with a considerable degree of ionic bonding are more sensitive to variations in temperature as compared to the linear lattice parameters (interatomic distances). It is experimentally in situ demonstrated with high-temperature X-ray diffraction that the β-NaB3O5 borate is peritectically melted at a temperature of 725 10C with the formation of the α-Na2B8O13 octaborate. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Glass Physics & Chemistry is the property of Springer Nature 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: 10.1134/S1087659607030054 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 9 StartPage: 217 Subjects: – SubjectFull: Thermal expansion Type: general – SubjectFull: Anisotropy Type: general – SubjectFull: X-ray diffraction Type: general – SubjectFull: Borates Type: general Titles: – TitleFull: High-temperature crystal chemistry of α-Na2B4O7 and β-NaB3O5 layered borates. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: N. Sennova – PersonEntity: Name: NameFull: R. Bubnova – PersonEntity: Name: NameFull: S. Filatov – PersonEntity: Name: NameFull: I. Polyakova IsPartOfRelationships: – BibEntity: Dates: – D: 05 M: 06 Text: Jun2007 Type: published Y: 2007 Identifiers: – Type: issn-print Value: 10876596 Numbering: – Type: volume Value: 33 – Type: issue Value: 3 Titles: – TitleFull: Glass Physics & Chemistry Type: main |
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