Dielectric properties and electrical conductivity of MgO synthesized by chemical precipitation and sol-gel method

Laboratoire de Valorisation des Matériaux Utiles (LVMU), Centre National des Recherches en Sciences des Matériaux, Technopole Borj Cedria BP 73, 8027 Soliman, Tunisia

^a e-mail: mb_rabeh@yahoo.fr

Received: 15 June 2013
Revised: 15 April 2014
Accepted: 18 April 2014
Published online: 7 January 2015

Abstract

MgO Powders were synthesized via simple chemical precipitation (SPC) and sol-gel process (SG). The electrical behavior of these powders was determined by complex impedance spectroscopy using an alternative current conductivity at various temperatures and frequencies. For MgO elaborated by SG, the activation energy is 1.49 eV while MgO prepared by SPC, this energy is equal to 0.39 and 4.13 eV. The structural properties of MgO powders were analyzed by X-ray diffraction and FT-IR spectroscopy. The results show that the cristallites size was 28.4 nm for MgO SPC and 42.5 nm for MgO SG. Others methods such DTA, TGA, BET and SEM were used to characterized MgO materials.