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The effect of dielectric constant on ion transport: a new Arrhenius equation

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Document pages: 11 pages

Abstract: Chitosan based solid and nanocomposite polymer electrolytes were prepared by solution casting method. XRD results showed that chitosan (CS) was complexed with LITF salt. Deconvolution of the diffraction pattern of nanocomposite solid polymer electrolyte shows that with the increase of alumina content to 4 , the weight percentage of amorphous domain increases. Further incorporation of alumina nanoparticles (6 to 10 wt. Al2O3) resulted in an increase in crystallinity (large grain size). The morphology (SEM and EDX) analysis well supported the XRD results. The similar trends of DC conductivity and dielectric constant with Al2O3 concentration were explained. TEM images are used to explain the phenomena of space charge and blocking effect. Reformulated Arrhenius equationon () was proposed from the smooth exponential behavior of DC conductivity versus dielectric constant at different temperatures. The more linear behavior of DC conductivity versus reveals the crucial role of dielectric constant in Arrhenius equation. The drawbacks of Arrhenius equation can be understood from the less linear behavior of DC conductivity versus . The relaxation processes have been interpreted in terms of Argand plots.

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