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Conductivity and dielectric investigation of NH4I-doped synthesized polymer electrolyte system

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Abstract

Conductivity and dielectric behavior of a synthesized NH4I-doped polymeric electrolytes are discussed in terms of σ, N/N 0, permittivity, loss factor, modulus, and Kohlrausch–Williams–Watts (KWW) exponent β, with the variation of salt concentration and temperature. System, having 50 wt% salt, has maximum conductivity (∼10−4 S cm−1). Addition of salt modifies the system from semicrystalline to amorphous which is further supported by peak shift in ∂logε′/∂logω vs logω curve. β follows the number of charge carrier’s pattern, with salt concentration. Collective analysis of impedance, dielectric, and modulus spectroscopy indicated a strong coupling between ion and polymer segmental motion, but at 50 % salt concentration, they are decoupled. Relaxation time analysis has affirmed this correlation. Merging tendency of logσ vs logω isotherms, for different salt concentrations and temperatures, at higher frequency indicates the dominance of superlinear power law phenomenon, even at room temperature, in megahertz frequency range.

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Acknowledgments

Authors are thankful to Prof. O. N. Srivastava, Department of Physics, Banaras Hindu University, Varanasi, for providing XRD facility. One of us (MK) great fully acknowledges UGC (India) for providing Rajiv Gandhi National Fellowship (RGNF). DST (India) is acknowledged for financial support (Project No SR/S2/CMP00652007/Dated 8.4.2008). Instruments of the project are used in present study.

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Authors and Affiliations

  1. Department of Physics (MMV), Banaras Hindu University, Varanasi, 221005, India

    Manindra Kumar & Neelam Srivastava

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  1. Manindra Kumar
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  2. Neelam Srivastava
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Correspondence to Neelam Srivastava.

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Kumar, M., Srivastava, N. Conductivity and dielectric investigation of NH4I-doped synthesized polymer electrolyte system. Ionics 21, 1301–1310 (2015). https://doi.org/10.1007/s11581-014-1294-x

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