Ac electrical properties and dielectric relaxation of the new mixed crystal (Na0.8Ag0.2)2PbP2O7

The new diphosphate compound containing sodium, silver and lead, (Na0.8Ag0.2)2PbP2O7, has been synthesized and characterized by X-ray diffraction (XRD) and electrical technique. (Na0.8Ag0.2)2PbP2O7, is of triclinic symmetry with the space group P1¯. The unit cell parameters are: a = 5.511(3) Å, b = 6.910(4) Å, c = 9.457(6) Å, α = 105.72(4)°, β = 96.81(5)°, γ = 108.40(4)° and V = 320.6(4) Å3. The ac conductivity and dielectric properties of (Na0.8Ag0.2)2PbP2O7 compound have been studied at temperatures in the range 573–692 K and frequencies (300 Hz to 5 MHz). The ac conductivity data reveal that for high frequency σac(ω) is proportional to ωn. The values of the frequency exponent, n, were found to increase by increasing temperature.