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AC Conductivity and Electrical Modulus Studies on Lithium Vanadophosphate Glasses

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The lithium vanadophosphate (LVP) glasses were synthesized through a conventional melt quench method for various modifier (m) to formers (f) ratios (m/f) [m%Li2O/f%{0.3V2O5+0.7P2O5}, where the m/f=0.43, 0.66, 1.0, 1.5, and 1.63]. Nature, structure, and glass transition Tg temperature for the prepared LVP samples were characterized by X-ray diffraction, FTIR, and DSC techniques, respectively. Impedance measurements were made for the various m/f ratios of LVP glasses at 423 K and above temperatures. The bulk conductivity () and the activation energy (Ea) for the LVP glass samples were calculated, respectively, from the analyzed impedance data of the various m/f ratios measured at different temperatures, using Boukamp equivalent circuit software. The best conducting [=4.83 × 10−8 S/cm at 423 K] m/f ratio of LVP was found to be 60%Li2O–40% [0.3V2O5+0.7P2O5] and its activation energy (Ea)=0.59 eV. AC conductivity was calculated from the impedance data and analyzed using Jonscher's power law for various m/f ratios of the LVP glasses at different temperatures. The power law exponent s, evaluated from AC conductivity of the LVP glasses, exhibited a non-linear behavior with temperatures. Kohlrausch–William–Watts stretched exponential function was used to fit the calculated modulus data and ion relaxation behavior was studied for the LVP glasses.
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Document Type: Research Article

Affiliations: 1: Department of Physics, School of Physical, Chemical & Applied Sciences, Pondicherry University, Pondicherry 605 014, India 2: HBL Power Systems Ltd., Hyderabad 500078, India

Publication date: 2007-01-01

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