Investigation of charge-carriers dynamics and sub/super-linear response for La0.8Na0.2-x□xMnO3 (x = 0 and 0.1) perovskite ceramics

Abstract

La0.8Na0.2-x□xMnO3 (x = 0 and 0.1) compounds were prepared by solid-state reaction. XRD patterns were used to check the structural properties. Experimental results were discussed in terms of different theoretical approaches. The temperature dependence of DC-conductivity displays the presence of a metal-semiconductor transition for x = 0 and 0.1. The introduction of 10%-vacancy provokes a significant increase in the conductivity. The electrical conductivity is explained by many kinds of hopping each one is pronounced in a different temperature region. Two deviation temperatures are observed. These temperatures coincide with the ANC temperatures and the change in the conduction process. For x = 0.1, the Nyquist diagrams shows the presence of a high frequency inductive behavior. AC-conductivity spectra obey to the JPL and DJP. Then, SPL and NCL behaviors appear at high frequency range. The power "s" presents the contribution of numerous conduction models. The scaling behavior reveals that the conductivity spectra obey to the TTS principle.