Structural, Dielectric and AC Conductivity of Multicomponent Borotellurite Glasses

Structural, dielectric and conductivity of multicomponent borotellurite glasses have been thorougly investigated. Noncrystallinity confirmed through XRD and structural units identified from FTIR spectra. Dielectric constant and loss decreased with increase of frequency and temperature. Polarization parameters such as molar volume, (Vm), molar refraction (Rm), molar polarizability (αm), electronic polarizability (αe) and metallization criterion (M) were determined. Power law behavior of ac conductivity has been verified and frequency exponent obtained. Activation energy of dc and ac conductivity obtained from Mott’s small polaron hopping model fits and discussed. Frequency exponent decreased with temperature as predicted by correlated barrier hopping model. Hunt’s model fit to conductivity data yielded similar frequency exponent values as obtained from power law. Linear relation between ac and dc conductivity has been observed as predicted by Barton, Nakajima and Namikawa theory. Time-temperature superposition principle has been verified by drawing master curves.