Fast ion motion in glassy and amorphous materials

Abstract Seeking a broad perspective we define a decoupling index R τ , 1 τ 13 , which describes how well the (fast ion) conducting modes are decoupled from the amorphous matrix. For glassy electrolytes the R τ must be high, > 10 8 . For successful (polymer + salt) “solid” electrolytes, R τ can be low, ∼1, provided T g 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 R τ polymer + salt constrained-liquid “solid” electrolytes, and analyze the X- and T- dependences of σ o 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.

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