Brillouin scattering in AgI rich glasses

L. Börjesson, S. W. Martin, L. M. Torell, C. A. Angell

Research output: Contribution to journalArticle

26 Scopus citations

Abstract

We present results of the first Brillouin scattering study to detect a picosecond time scale phonon damping relaxation due to fast ion diffusion in a glassy solid. The effect is observed in a fast ion conducting glass, (AgI)0.6 (Ag2O + 2B2O3)0.4, and occurs due to coupling between GHz phonons and the same Ag+ diffusive modes which determine the "superionic" conductivity. Comparison of the derived internal friction peak with results from lower frequencies (and lower temperature) imply that it is only the mobilities of Ag+ that change with temperature - not the number capable of moving (weak electrolyte model). The relaxation process can be characterized by a single relaxation time in contrast with the lower temperature behavior. Also, Brillouin scattering data of (AgI)x (AgPO3)1-x glasses for x = 0, 0.1, 0.3, 0.4 and 0.5 show that the hypersonic velocities, the elastic constants and the modulii extrapolate to those of pure α-AgI in accordance with the micromain model for AgI rich glasses.

Original languageEnglish (US)
Pages (from-to)431-436
Number of pages6
JournalSolid State Ionics
Volume18-19
Issue numberPART 1
DOIs
StatePublished - Jan 1986
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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    Börjesson, L., Martin, S. W., Torell, L. M., & Angell, C. A. (1986). Brillouin scattering in AgI rich glasses. Solid State Ionics, 18-19(PART 1), 431-436. https://doi.org/10.1016/0167-2738(86)90155-4