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Advances in understanding the structure of borosilicate glasses: A Raman spectroscopy study

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Published/Copyright: April 1, 2015
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American Mineralogist
From the journal American Mineralogist Volume 94 Issue 5-6

Abstract

This study is focused on the behavior of ternary SiO2-Na2O-B2O3 borosilicate glasses at temperatures between 298 and 1800 K. Unpolarized Raman spectra were measured up to high temperature. SiO2-Na2O-B2O3 glass samples were prepared with different values of the ratio R = [Na2O]/[B2O3], while the ratio K = [SiO2]/[B2O3] was kept constant and equal to 2.12. Spectra were measured at room temperature in samples with 0.43 ≤ R ≤ 1.68, and the effect of the modifier content was clearly observed in these glasses, only in partial agreement with previous literature results. In particular, the formation in the glass of sodium-danburite units Na2O·B2O3·2SiO2 was postulated. This feature led to a new assessment of R*, the critical value of R above which every new alkali atom added to the system breaks a Fo-O-Fo (Fo = glass former) bridge causing depolymerization of the glass. A revised formula is proposed to obtain the value of R* as a function of K.

Raman spectra measured at high temperature yielded important information about the temperaturedependent evolution of the borosilicate system. In particular, borate and borosilicate units including tetra-coordinated boron seem to be unstable at high temperature, where the formation of metaborate chains or rings is fostered. Above 1500 °C, evaporation of borate compounds is clearly observed, stemming from the small sample size.

Keywords : Glass; borosilicate; structure; Raman spectroscopy
Received: 2008-5-23
Accepted: 2008-12-12
Published Online: 2015-4-1
Published in Print: 2009-5-1

© 2015 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am.2009.3027
Keywords for this article
Glass; borosilicate; structure; Raman spectroscopy

Articles in the same Issue

  1. Closure temperatures of intracrystalline ordering in anatectic and metamorphic hercynite, Fe2+Al2O4
  2. Arsenate substitution in hydroxylapatite: Structural characterization of the Ca5(PxAs1–xO4)3OH solid solution
  3. The crystal chemical role of Zn in alunite-type minerals: Structure refinements for kintoreite and zincian kintoreite
  4. Application of precession electron diffraction to the characterization of (021) twinning in pseudo-hexagonal coesite
  5. Structure, thermodynamic, and transport properties of molten Mg2SiO4: Molecular dynamics simulations and model EOS
  6. High-pressure behavior of åkermanite and gehlenite and phase stability of the normal structure in melilites
  7. Synchrotron-based speciation of chromium in an Oxisol from New Caledonia: Importance of secondary Fe-oxyhydroxides
  8. Meurigite-Na, a new species, and the relationship between phosphofibrite and meurigite
  9. The role of silver on the stabilization of the incommensurately modulated structure in calaverite, AuTe2
  10. Hydrogen zoning in zinc-bearing staurolite from a high-P, low-T diasporite (Samos, Greece): A combined EMP-SIMS-FIB-FTIR study
  11. Dmitryivanovite: A new high-pressure calcium aluminum oxide from the Northwest Africa 470 CH3 chondrite characterized using electron backscatter diffraction analysis
  12. Crystal chemistry of hydrous forsterite and its vibrational properties up to 41 GPa
  13. The geothermobarometric potential of tourmaline, based on experimental and natural data
  14. Inverse spinel structure of Co-doped gahnite
  15. Advances in understanding the structure of borosilicate glasses: A Raman spectroscopy study
  16. The occurrence of tetrahedrally coordinated Al and B in tourmaline: An 11B and 27Al MAS NMR study
  17. Accurate and precise lattice parameters by selected-area electron diffraction in the transmission electron microscope
  18. Two types of metamorphic monazite with contrasting La/Nd, Th, and Y signatures in an ultrahigh-pressure metapelite from the Pohorje Mountains, Slovenia: Indications for pressure-dependent REE exchange between apatite and monazite?
  19. Cs-exchange in birnessite: Reaction mechanisms inferred from time-resolved X-ray diffraction and transmission electron microscopy
  20. Crystal chemistry and radiation-induced amorphization of P-coffinite from the natural fission reactor at Bangombé, Gabon
  21. Letter. Tistarite, Ti2O3, a new refractory mineral from the Allende meteorite
  22. Letter. Davisite, CaScAlSiO6, a new pyroxene from the Allende meteorite
  23. Letter. The 4500 cm–1 infrared absorption band in hydrous aluminosilicate glasses is a combination band of the fundamental (Si,Al)-OH and O-H vibrations
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