LOW-FREQUENCY DISPERSION IN THE [50AG(2)O(X)B2O3(50-X)P2O5] GLASS SYSTEM

The dielectric properties of two glasses with compositions, in mol%, 5 0Ag(2)0:50P(2)O(5) and 50Ag(2)0:25B(2)O(3):25P(2)O(5) have been measur ed. Temperatures ranged from 120 to 400 K and measurement frequency ra nged from 10(-2) to 10(5) Hz. Samples of the glass 50Ag(2)O:50P(2)O(5) have shown a conduction mechanism at low frequencies termed 'low freq uency dispersion' (LFD), whereas the conductivity of samples of the gl ass 50Ag(2)O:25B(2)O(3):25P(2)O(5) have an electrical dipolar phenomen a due to a generalised Maxwell-Wagner electrode effect at low frequenc ies. The activation energies for binary and ternary glass samples are found to be 0.47 +/- 0.03 and 0.44 +/- 0.03 eV, respectively. The meas ured capacitance data are further analysed in terms of a modulus and i mpedance formalism.