Fast ion motion in glassy and amorphous materials

C. A. Angell

Research output: Contribution to journalArticlepeer-review

309 Scopus citations


Seeking a broad perspective we define a decoupling index Rτ, 1 < Rτ < 1013, which describes how well the (fast ion) conducting modes are decoupled from the amorphous matrix. For glassy electrolytes the Rτ must be high, > 108. For successful (polymer + salt) "solid" electrolytes, Rτ can be low, ∼1, provided Tg is low. We review recent findings for Group 1A and 1B cation glasses and contrast them with results for new LiI-rich organic cation glasses. The theoretical maximum conductivity for glassy systems, considering the quench rate factor, is analyzed, and the far IR conductivity is correlated with σ(ω) measurements. Then we consider the low Rτ polymer + salt constrained-liquid "solid" electrolytes, and analyze the X- and T- dependences of σo for such cases. Finally we correlate mechanical and electrical relaxation phenomena, and review insights from computer simulation studies for oxides and sulfides. These support a gated channel mechanism for migration.

Original languageEnglish (US)
Pages (from-to)3-16
Number of pages14
JournalSolid State Ionics
Issue numberPART 1
StatePublished - Dec 1983
Externally publishedYes

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics


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