High-frequency relaxational spectroscopy in liquid borates and silicates

J. Kieffer, J. E. Masnik, B. J. Reardon, J. D. Bass

Research output: Contribution to journalArticle

Abstract

The Brillouin light scattering technique is used to investigate the structural relaxations in various glass-forming systems. Resonance conditions of various thermally activated processes contributing to the relaxation phenomena are detected by means of temperature scans. The lineshape analysis of the Brillouin spectra yields the two components of the complex mechanical modulus, i.e., storage and loss modulus, allowing one to track the dynamic behavior of structural components on a nanometer scale. The storage modulus reflects the extent of network polycondensation, while losses are due to the friction caused by mobile structural constituents. Data from a series of binary alkali-borate and alkali-silicate systems are reported. Significant responses to the GHz actuation occur above the glass transition temperature. An increased fragility with increasing alkali oxide concentration in reflected in the accelerated decrease of the longitudinal modulus with temperature, for both borates and silicates. In borates, the room-temperature longitudinal modulus increases with increasing alkali concentration, up to at least 30 mol% alkali oxide. The observation of a distinct alkali dissipation peak in silicates indicates that the alkali cation mobility is largely decoupled from network relaxations, while the dissipation spectra for borates reflect a wider distribution of relaxation mechanisms.

Original languageEnglish (US)
Pages (from-to)51-60
Number of pages10
JournalJournal of Non-Crystalline Solids
Volume183
Issue number1-2
DOIs
StatePublished - Apr 1 1995

Fingerprint

Silicates
Borates
Alkalies
borates
alkalies
silicates
Spectroscopy
Brillouin scattering
Liquids
liquids
spectroscopy
Elastic moduli
Structural relaxation
Oxides
Polycondensation
Light scattering
Temperature
dissipation
Positive ions
Friction

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry

Cite this

High-frequency relaxational spectroscopy in liquid borates and silicates. / Kieffer, J.; Masnik, J. E.; Reardon, B. J.; Bass, J. D.

In: Journal of Non-Crystalline Solids, Vol. 183, No. 1-2, 01.04.1995, p. 51-60.

Research output: Contribution to journalArticle

Kieffer, J. ; Masnik, J. E. ; Reardon, B. J. ; Bass, J. D. / High-frequency relaxational spectroscopy in liquid borates and silicates. In: Journal of Non-Crystalline Solids. 1995 ; Vol. 183, No. 1-2. pp. 51-60.
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