Electrical, dielectric properties and study of AC electrical conduction mechanism of Li _0.9 □ _0.1 NiV _0.5 P _0.5 O ₄

Abstract

In this paper, we report the measurements of impedance spectroscopy for a new olivine-type lithium deficiency Li0.9□0.1NiV0.5P0.5O4 compound. It was synthesized by the conventional solid-state technique. All the X-ray diffraction peaks of the compound are indexed, and it is found that the sample is well crystallized in orthorhombic olivine structure belonging to the space group Pnma. Conductivity and dielectric analyses of the sample are carried out at different temperatures and frequencies using the complex impedance spectroscopy technique. The electrical conductivity of Li0.9□0.1NiV0.5P0.5O4 is higher than that of parent compound LiNiV0.5P0.5O4. Temperature dependence of the DC conductivity and modulus was found to obey the Arrhenius law. The obtained values of activation energy are different which confirms that transport in the title compound is not due to a simple hopping mechanism. To determine the conduction mechanism, the AC conductivity and its frequency exponent have been analysed in this work by a theoretical model based on quantum mechanical tunnelling: the non-overlapping small polaron tunnelling model.

Dielectric analysis and electrical conduction mechanism of La1−xBixFeO3ceramics

“…The obtained activation energies were similar to those of a dielectric relaxation analysis, indicating that the electrical transport arose from the hopping mechanism. 39 The activation energies of all samples satised 0.20 < E a < 1.0 eV, indicating a conduction mechanism dominated by p-type polaron hopping. 6,8 Lowering the activation energy following by increasing in high conductivity makes our as-synthesize La 1Àx Bi x FeO 3 a promising candidate for catalyst material applying in electrode surface for electrochemical reactions.…”

Electrical Properties of Double Perovskite LaPbFeTiO6 Synthesized by Sol-Gel Method

“…. The activation energy value obtained for LaPbFeTiO6 is 0.29 eV, it is clear that the activation energy values obtained from the conductivity and dielectric relaxation analysis are very close, indicating that the electric charge carriers originate from the hopping mechanism [26]. In the region of higher frequencies and temperatures, the conductivity values are large, which is attributable to a higher mobility of the charge carriers.…”

Complex dielectric permittivity, electric modulus and electrical conductivity analysis of Au/Si3N4/p-GaAs (MOS) capacitor

“…The temperature dependence of ac conductivity can be described by Arrhenius equation given as follows [35][36][37][38][39][40][41],…”

“…where r dc represents the dc part of conductivity which is frequency independent, and Ax s represent the ac part of conductivity which is frequency dependent. Thus, the ac conductivity (r ac ) is defined as [41][42][43][44][45][46][47][48],…”