Abstract
Solid state ionics is presently largely concerned with non crystalline materials such as salt-polymer complexes and inorganic glassy electrolytes. For salt-polymer complexes, ionic conductivity is observed above T g , the glass transition temperature, and appears to follow a V.T.F. behaviour expressed σ = A’exp (-B’/R(T-T 0 )). For glassy electrolytes, below their T g temperature, ionic conductivity obeys an Arrhenius law expressed as σ = A exp (-B/RT). In the two cases, charge carrier formation may be described by partial dissociation of ionic pairs equivalent to Frenkel defect formation. Defect migration in a glass is caused by an indirect interstitial process which is an activated process. For organic polymers above their T g , defect migration occurs through a cooperative mechanism involving the neighbouring atoms. This process is a purely en-tropic mechanism resulting in a local concentration of the “free volume” evenly distributed throughout the supercooled liquid. This mechanism vanishes at the same temperature T 0 at which the configurational entropy of the supercooled liquid disappears. For glasses, isothermal large variations in the ionic conductivity with composition are the result of consistent variations of the chemical potential of dissociating species which may be explained by classical solution thermodynamics.
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Souquet, J.L. (1994). Ionic Transport in Glassy and Polymer Electrolytes. In: Catlow, C.R.A. (eds) Defects and Disorder in Crystalline and Amorphous Solids. NATO ASI Series, vol 418. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-1942-9_10
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DOI: https://doi.org/10.1007/978-94-011-1942-9_10
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