Electronic transport and relaxation studies in bismuth modified zinc boro-tellurite glasses

摘要: Abstract The ac conductivity of tellurium based quaternary glasses having composition 60 TeO 2 – 10 ZnO (30 − x) B O 3 xBi ; x = 0, 5, 10, 15 and 20 has been investigated in the frequency range −1  Hz to 5 temperature 483 K–593 K. dependent increase with bismuth content found obey Jonscher's universal power law. dc conductivity, crossover exponent have estimated from fitting experimental data In studied conduction may be described by overlapping large polaron tunneling model. activation energy is decrease variable hopping (VRH) proposed Mott some modification suggested Punia et al. more or less suitable explain conduction. value stretched (β) obtained M″ reveals presence non-Debye type relaxation presently glass samples. Scaling spectra electric modulus (M′ M″) collapse into a single master curve for all compositions temperatures. values (E R ) (W) are nearly equal glasses, indicating that overcome same barrier during as well processes. process samples independent.