Ac conductivity relaxation processes and its scaling behavior in sodium bismuthate glasses.

Ac conductivity measurements and its analysis has been performed on the glassy ionic conducting x Na₂O + (1 − x) Bi₂O₃ system in the frequency range from 20 Hz to 1 MHz and in the temperature range 450 K to 750 K. The composition dependence of the dc electrical conductivity and activation energy has been obtained. The electrical relaxation analysis has been inquired on these glasses with universal power law and the random free energy barrier model. The relaxation parameters are obtained from the analysis has been compared. All experimentally known features of the σ′(ω) including its scaling behavior are explained satisfactorily. The results show an excellent agreement of scaling behavior based on random free energy barrier model and universal power law. [ABSTRACT FROM AUTHOR]