Ionic conductivity of praseodymium doped silver-borate glasses

Glasses of the composition xPr6O11-(35 − x) Ag2O-65B2O3 (x = 0, 0.1-0.5 mol%) have been prepared using the melt quenching method. The ac and dc conductivity and dielectric properties of glass have been measured over a wide range of frequencies and temperatures. Experimental results indicate that the ac conductivity and the dielectric constants depend on temperature, frequency and praseodymium content. The conductivity as a function of frequency exhibited two components: dc conductivity (σdc), and ac conductivity (σac). The activation energies are estimated and discussed. The impedance plot at each temperature appeared as a semicircle passes through the origin. In all the samples, only one semicircle has been observed over the entire range of temperature studied indicating only one type of conduction mechanism.