TY - JOUR
T1 - Fast ion motion in glassy and amorphous materials
AU - Angell, C. A.
N1 - Funding Information:
The author is indebted to his co-workers E. I. Cooper, C. Liu, S. W. Martin and S. Tamaddon for many discussions and the use of certain current results in advance of full publication. Our overall program has been supported in different aspects by NSF-MRL Grant No. DMR 7302643A01, DOE EPRIP Grant No. De 100448 and ONR Agreement No. N0014-78-C-0035.
PY - 1983/12
Y1 - 1983/12
N2 - 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.
AB - 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.
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U2 - 10.1016/0167-2738(83)90206-0
DO - 10.1016/0167-2738(83)90206-0
M3 - Article
AN - SCOPUS:0141981779
SN - 0167-2738
VL - 9-10
SP - 3
EP - 16
JO - Solid State Ionics
JF - Solid State Ionics
IS - PART 1
ER -