Mechanical vs electrical relaxation in Agl-based fast ion conducting glasses

Changle Liu, Charles Angell

Research output: Contribution to journalArticle

93 Citations (Scopus)

Abstract

Results of a low frequency mechanical relaxation study of a fast ion conducting system, and comparison of mechanical with electrical conductivity relaxation in the same system, are reported, using the system AgI + AgPO3. As predicted from conductivity studies, the mechanical relaxation in the highest conducting glasses occurs at very low temperatures ∼ -170°C. Studies of the system AgIAgBO2 and exploratory work on mixed oxyanion glasses are also reported. The tensile (Young's) moduli are consistent with values recently obtained from GHz range light-scattering studies. The dispersion in Young's modulus due to the fast ion relaxation is very large, even exceeding those seen in mixed alkali glasses, and it occurs over a much wider temperature range than the corresponding dispersion in the electrical modulus, even though the loss peaks occur within 3 K of one another. The electrical and mechanical loss peaks are found to have the same temperature dependence, and this fact is used to develop a reduced representation of the mechanical relaxation data, suitably normalized in frequency space (ωτ). Both the normalized loss peak height and halfwidth in this representation imply exceptional departures from exponential relaxation with β = 0.25 in the Kohlrausch decay function Θ(t) = exp - ([t/τ]β). The mechanical relaxation evidently has elements both slower and faster than those characterizing the electrical relaxation. A general "relaxation map" of τ vs 1/T for mechanical and electrical phenomena in this system is proved.

Original languageEnglish (US)
Pages (from-to)162-184
Number of pages23
JournalJournal of Non-Crystalline Solids
Volume83
Issue number1-2
DOIs
StatePublished - Jun 2 1986
Externally publishedYes

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Anelastic relaxation
Ions
conduction
Glass
glass
ions
Elastic moduli
Alkalies
Light scattering
Temperature
modulus of elasticity
alkalies
light scattering
low frequencies
conductivity
temperature dependence

ASJC Scopus subject areas

  • Ceramics and Composites
  • Electronic, Optical and Magnetic Materials

Cite this

Mechanical vs electrical relaxation in Agl-based fast ion conducting glasses. / Liu, Changle; Angell, Charles.

In: Journal of Non-Crystalline Solids, Vol. 83, No. 1-2, 02.06.1986, p. 162-184.

Research output: Contribution to journalArticle

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