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Structural and Ion Transport Properties of [(AgI)x(AgBr)0.4‐x](LiPO3)0.6 and (AgBr)x(LiPO3)(1‐x) Solid Electrolytes

Research paper by Asheesh Kumar, Raghunandan Sharma, Chhatrasal Gayner, Siddanathi Nageswara Rao, Devendra P. Singh, Malay K. Das, Kamal K. Kar

Indexed on: 01 Apr '16Published on: 01 Mar '16Published in: International Journal of Applied Glass Science



Abstract

The (AgBr)x(LiPO3)(1‐x) (x = 0.4 and 0.5) and [(AgI)x(AgBr)0.4‐x](LiPO3)0.6 (x = 0.1, 0.2, and 0.3) superionic electrolytes have been prepared by conventional melt quenching using a twin roller. These electrolytes are characterized by X‐ray diffraction, SEM, and EDAX for structural investigation. Electrical characterizations have been carried out by the AC impedance analysis. The conductivity of LiPO3 glassy system at room temperature is improved by doping with the silver bromide (AgBr)x(LiPO3)(1‐x) and the mixture of silver iodide and silver bromide (AgI‐AgBr‐LiPO3 system) up to 10−5 and 10−3/Ω/cm, respectively (improvements by four or five orders of magnitude). The frequency response of ionic conductivity has been analyzed by universal dynamic response model (Jonscher's law), and AC conductivity data is fitted using Jonscher's power law. The conductivity values obtained by the power law and impedance plots are comparable. The frequency exponent (n) has a value between 0 and 1. The AgI‐AgBr‐LiPO3 system shows the mixed alkali effect. Summerfield scaling master curve is temperature dependent, which may be due to the contribution of the both lithium and silver ions to ionic conduction.