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Structural relaxation mechanisms in hydrous sodium borosilicate glasses

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Authors

  • H. Behrens
  • Ute Bauer
  • S. Reinsch
  • P. Kiefer

External Research Organisations

  • BAM Federal Institute for Materials Research and Testing
  • Clausthal University of Technology
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Details

Original languageEnglish
Pages (from-to)30-39
Number of pages10
JournalJournal of Non-Crystalline Solids
Volume497
Early online date28 May 2018
Publication statusPublished - 1 Oct 2018

Abstract

Borosilicate glasses (16Na2O–10B2O3–74SiO2, NBS) with water contents up to 22 mol% H2O were prepared to study the effect of water on structural relaxation using DTA, viscometry and internal friction measurements. The results show that the glass transition temperature Tg of DTA and the isokom temperature T12, of viscometry are in excellent agreement, confirming the equivalence of enthalpy and viscous relaxation for NBS glass. Combining Tg data with water speciation data demonstrates that OH groups are mainly responsible for the decrease of Tg with increasing hydration, while molecular water plays only a minor role. Internal friction spectra at 7.125 Hz confirm the decisive influence of water on mechanical relaxation. The temperature range of α-relaxation (glass transition) strongly decreases while two β-relaxation peaks (sub-Tg) progressively appear with increasing water content. A high temperature β-relaxation peak, attributed to the presence of OH groups, shifts from 670 to 450 K as total water content increases from 0.01 to 5 wt%. A low temperature β-relaxation peak, attributed to molecular water, appears at 380 K and 330 K in glasses containing 3 and 5 wt% H2O, respectively. These findings suggest that relaxation mechanism of different hydrous species at low temperature may contribute to fatigue of stressed glasses.

Keywords

    Borosilicate glasses, Glass transition, Internal friction, Relaxation, Water

ASJC Scopus subject areas

Cite this

Structural relaxation mechanisms in hydrous sodium borosilicate glasses. / Behrens, H.; Bauer, Ute; Reinsch, S. et al.
In: Journal of Non-Crystalline Solids, Vol. 497, 01.10.2018, p. 30-39.

Research output: Contribution to journalArticleResearchpeer review

Behrens, H, Bauer, U, Reinsch, S, Kiefer, P, Müller, R & Deubener, J 2018, 'Structural relaxation mechanisms in hydrous sodium borosilicate glasses', Journal of Non-Crystalline Solids, vol. 497, pp. 30-39. https://doi.org/10.1016/j.jnoncrysol.2018.05.025
Behrens H, Bauer U, Reinsch S, Kiefer P, Müller R, Deubener J. Structural relaxation mechanisms in hydrous sodium borosilicate glasses. Journal of Non-Crystalline Solids. 2018 Oct 1;497:30-39. Epub 2018 May 28. doi: 10.1016/j.jnoncrysol.2018.05.025
Behrens, H. ; Bauer, Ute ; Reinsch, S. et al. / Structural relaxation mechanisms in hydrous sodium borosilicate glasses. In: Journal of Non-Crystalline Solids. 2018 ; Vol. 497. pp. 30-39.
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AU - Behrens, H.

AU - Bauer, Ute

AU - Reinsch, S.

AU - Kiefer, P.

AU - Müller, R.

AU - Deubener, J.

N1 - © 2018 Elsevier B.V. All rights reserved.

PY - 2018/10/1

Y1 - 2018/10/1

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