AC conductivity and dielectric relaxation in V 2 O 5 -P 2 O 5 -B 2 O 3 glasses

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Abstract

We investigated the AC conductivity in 60V 2 O 5 -(40-x)P 2 O 5 -xB 2 O 3 (x=5, 10, 20, 30 and 35mol%) glasses as a function of temperature. The measurements were carried out in the frequency range from 20Hz to 1MHz with varying temperatures (303-473K). The samples were characterized by using X-ray diffraction (XRD) and thermogravimetric-differential thermal analysis (TG-DTA) techniques. The molar volume increases monotonically with the decrease in density. The AC conductivity increases with B 2 O 3 content and temperature. The AC conductivity exhibited a Jonscher's universal power law and it is observed that as the temperature increases, frequency exponent (s) decreases. The dielectric constant of the sample decreases with increasing frequency and increases with temperature and concentration of B 2 O 3 . The electric modulus representation has been used to provide comparative analysis of the ion transport properties in these glasses. Scaling by using electric modulus shows overlap on single master curve signifying that the conduction mechanism is independent of temperature.

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Barde, R. V., Nemade, K. R., & Waghuley, S. A. (2015). AC conductivity and dielectric relaxation in V 2 O 5 -P 2 O 5 -B 2 O 3 glasses. Journal of Asian Ceramic Societies, 3(1), 116–122. https://doi.org/10.1016/j.jascer.2014.11.006

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