Ac conductivity, dielectric studies and conductivity scaling of NASICON materials

Different NASICON systems with general formula AmBnP3O12 were prepared by melt quenching method, where A=Na, and B=Cu, Al, Fe, FeCd. The prepared compounds were characterized by X-ray diffraction, and Fourier transform infrared spectroscopy. The electrical conductivity measurements were made on the different NASICON materials as a function of frequency (20 Hz to 1 MHz) at different temperatures. The bulk conductivity was obtained from the impedance analysis. The dc conductivity activation energies are found to be in the range 0.40–1.53 eV. The conductivity and dielectric spectra show the power low feature. The framework of the Almond–West conductivity formalism is applied to discuss the ac conductivity and determined the dc conductivity σdc, hopping frequency ωp, and dimensionless frequency exponent n. The conductivity master curves for the conductivity spectra are obtained by scaling the frequency by (i) ωp and (ii) σdcT, where T is temperature in Kelvin. Both types of scaling show same conductivity master curves.