Dielectric Investigations and Modulus Analysis of Lithium Bismuth Borate Glasses Doped with Molybdenum and Vanadium Oxides

Abstract

Lithium Bismuth Borate Glasses doped with Molybdenum and Vanadium oxides having composition x(MoO₃.V₂O₅).(30-x)Li₂O.50B₂O₃.20Bi₂O₃ where x = 0, 2, 5, 7 and 10 (abbreviated as MV0LBB, MV2LBB, MV5LBB, MV7LBB and MV10LBB respectively) are synthesized by standard melt quench technique. The amorphous nature of synthesized glasses has been confirmed through peak free X-ray measurements. Electrical properties of the samples i.e. different dielectric parameters are studied using Impedance Spectroscopy and their variations with frequencies (frequency range of 100 Hz to 5MHz) and different temperatures (from room temperature to 400ºC) are investigated. Dielectric constant (ε′) and dielectric loss (tanδ) are found to be increasing with the increase in temperature while these decreases with increase in the frequency which is due to energy loss by gathering of space charge near the electrode interface due to polarization and ionic conduction. Real part of modulus (M’) increases with increasing frequency and a saturation in the value at higher frequency. Imaginary part of modulus shows characteristic peak with frequency variation, which confirms relaxation process in conductivity.