Temperature dependent electrical properties of combustion synthesized GdAlO3 perovskite

Abstract

Gadolinium aluminate (GdAlO3) perovskite has been prepared from Gadolinium oxide and Aluminium nitrate by auto-igniting combustion process. Scanning electron micrographs also suggest polycrystalline microstructure with the grains of unequal size distributed throughout the pellet sample. Temperature and frequency dependence of dielectric properties have been investigated for the sample in the frequency range 1Hz-1MHz. The dielectric characteristics of the sample have been studied by analyzing electric conductivity, dielectric spectra, dielectric loss and electric modulus formalism. The frequency dependent ac conductivity has been analyzed by using Jonscher’s universal power law. The frequency exponent (n) have been found to be temperature dependent. The behavior of n with increase in temperature further suggested that the ac conduction mechanism of the studied samples follows the overlapping large polaron tunneling (OLPT) model.Gadolinium aluminate (GdAlO3) perovskite has been prepared from Gadolinium oxide and Aluminium nitrate by auto-igniting combustion process. Scanning electron micrographs also suggest polycrystalline microstructure with the grains of unequal size distributed throughout the pellet sample. Temperature and frequency dependence of dielectric properties have been investigated for the sample in the frequency range 1Hz-1MHz. The dielectric characteristics of the sample have been studied by analyzing electric conductivity, dielectric spectra, dielectric loss and electric modulus formalism. The frequency dependent ac conductivity has been analyzed by using Jonscher’s universal power law. The frequency exponent (n) have been found to be temperature dependent. The behavior of n with increase in temperature further suggested that the ac conduction mechanism of the studied samples follows the overlapping large polaron tunneling (OLPT) model.