Near Constant Loss Dielectric Response In 2Bi2O3-B2O3 Glasses

Electrical conduction and relaxation phenomena in bismuth borate glasses in the composition 2Bi2O3-B2O3 (Bi4B2O9) were investigated. Dielectric studies carried out on these glasses revealed near constant loss response in the 1 kHz-1 MHz frequency range at moderately high temperatures (300-450K) associated with relatively low loss and high dielectric constant. The variation in AC conductivity with temperature at different frequencies showed a crossover from near constant loss response characterised by local ion vibration within the potential well to universal Jonscher's power law dependence triggered by ion hopping between potential wells or cages.