Broadband dielectric response of binary borate glasses

The dielectric response of borate glasses Ag2O.nB(2)O(3) has been investigated as a function of the composition using a broadband measurement technique in the frequency range 10(-3) Hz-10(9) Hz. This approach reveals a d.c. plateau at low frequencies, a power law dispersive behaviour at intermediate frequencies, and a nearly constant loss regime in the high frequency limit, already at room temperature. The log of the d.c. conductivity linearly increases with increasing Ag2O molar fraction in the compositional range investigated. Analysing the experimental data either in terms of frequency dependent conductivity or in terms of complex dielectric modulus the results indicate that the shapes of the electrical dispersive behaviour in the Ag2O.nB(2)O, borate glasses, as well as their dielectric response in the nearly constant loss regime are influenced by the composition