Brillouin scattering in AgI rich glasses

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

doi:10.1016/0167-2738(86)90155-4

Brillouin scattering in AgI rich glasses

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

Research output: Contribution to journal › Article › peer-review

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 language	English (US)
Pages (from-to)	431-436
Number of pages	6
Journal	Solid State Ionics
Volume	18-19
Issue number	PART 1
DOIs	https://doi.org/10.1016/0167-2738(86)90155-4
State	Published - Jan 1986
Externally published	Yes

ASJC Scopus subject areas

General Chemistry
General Materials Science
Condensed Matter Physics

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title = "Brillouin scattering in AgI rich glasses",

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.",

author = "L. B{\"o}rjesson and Martin, {S. W.} and Torell, {L. M.} and Angell, {C. A.}",

note = "Funding Information: The authors are indebted to Y. Choi and C. Liu, Purdue University, for providing refractive index and density data, respectively. The work has been supported financially by Stiftelsen Lars Hiertas Minne, the Swedish Natural Science Research Council and VSNSF.",

year = "1986",

month = jan,

doi = "10.1016/0167-2738(86)90155-4",

language = "English (US)",

volume = "18-19",

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journal = "Solid State Ionics",

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T1 - Brillouin scattering in AgI rich glasses

AU - Börjesson, L.

AU - Martin, S. W.

AU - Torell, L. M.

AU - Angell, C. A.

N1 - Funding Information: The authors are indebted to Y. Choi and C. Liu, Purdue University, for providing refractive index and density data, respectively. The work has been supported financially by Stiftelsen Lars Hiertas Minne, the Swedish Natural Science Research Council and VSNSF.

PY - 1986/1

Y1 - 1986/1

N2 - 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.

AB - 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.

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Brillouin scattering in AgI rich glasses

Abstract

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