Brillouin scattering in AgI rich glasses

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

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


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
Issue numberPART 1
StatePublished - Jan 1986
Externally publishedYes

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics


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