The samples of composition 60V 2 O 5 -5P 2 O 5 -(35−x)B 2 O 3 -xCeO 2 , x = 1, 2, 3, 4 and 5 mol% were prepared by the melt-quench method. The prepared samples were characterized by X-ray diffraction, thermogravimetric-differential thermal analysis and impedance spectroscopy. The activation energies were evaluated using glass transition temperature (T g ) and peak temperature of crystallization (T c ). The dependence of activation energy on composition was discussed. AC conductivity of samples

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... as been analysed. Electrical conductance and capacitance were measured over a frequency range of 20 Hz-1 MHz and a temperature range of 303-473 K. At room temperature, maximum value of electrical conductivity was observed to be 0.0024 S cm −1 for x = 1. The samples show semiconducting features predominantly based on an ionic mechanism.