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Dynamics of lithium ions in tellurium phosphate glasses: correlation with structure

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In the present work we have studied dynamics of Li+ ions in xLi2O–(1–x)[0·4TeO2–0·6P2O5] glasses, where 0·30≤x≤0·45. We have measured ac conductivity for a wide range of frequency and temperature. The real part of the conductivity spectra has been analyzed using Almond–West power law formalism. We have observed that the dc conductivity increases and the activation energy decreases with the increase of Li2O content. We have also observed that the d.c. conductivity and crossover frequency obey Arrhenius relation. The time–temperature superposition has been verified using the scaling of conductivity spectra. We have calculated microscopic lengths of ion dynamics, such as the characteristic mean square displacement of mobile ions and the spatial extent of localized motion, within the framework of linear response theory. We have observed that both the lengths decrease with the increase in Li2O content. Besides, we have also investigated the Fourier transform infrared (FTIR) spectroscopy to study the structural aspect of the glassy network, and have established a simple correlation between ion dynamics and network structure.
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Document Type: Research Article

Publication date: 01 October 2018

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