Eur. Phys. J. Plus (2016) 131: 325
https://doi.org/10.1140/epjp/i2016-16325-x

Regular Article

Fe substitution for Mn in PrSrCaMnO - The electrical and dielectrical properties of Pr_0.6Sr_0.3Ca_0.1Mn_1-xFe_xO₃ perovskite

¹ Laboratoire de Physique des Matériaux et des Nanomatériaux appliquée à l’Environnement, Faculté des Sciences de Gabès, Université de Gabès, cité Erriadh 6079, Gabès, Tunisia
² Unité de Recherche Matériaux Avancés et Nanotechnologies, ISSAT Kasserine 1200, Université de Kairouan, Kairouan, Tunisia
³ Laboratoire de Physico-Chimie des Matériaux, Département de Physique, Faculté des Sciences de Monastir, Université de Monastir, B. P. 22, 5019, Monastir, Tunisia

^* e-mail: rahmounihedi@yahoo.fr

Received: 6 November 2015
Accepted: 24 August 2016
Published online: 20 September 2016

Abstract

We have performed admittance spectroscopy measurements on a series of (PSCMO) compounds with , 0.025, 0.050 and 0.075. The results show that all samples exhibit a metal-insulator transition at a temperature which decreases with the iron content. The conduction mechanism is described by thermally activated hopping of small polaron. Activation energy changes at specific temperature T _s, probably due to the contribution of the polarization effect to the conductivity. The dielectric permittivity increases with the temperature until a temperature T _d near the specific temperature T _s and then begins to decrease. This is explained by the fact that at a certain temperature, the free carriers acquire sufficient energy to overcome potential barriers, and so they enhance the conductivity and decrease the polarization. The dielectric permittivity measurements are well described by a modified Curie-Weiss law.