Table of Contents
ISRN Spectroscopy
Volume 2012, Article ID 706398, 8 pages
http://dx.doi.org/10.5402/2012/706398
Research Article

Mn3O4 Nanoparticles: Synthesis, Characterization, and Dielectric Properties

1Laboratoire des Matériaux Utiles, Institut National de Recherche et d’Analyse Physico-Chimique, Pôle Technologique de Sidi-Thabet, 2020 Tunis, Tunisia
2Unité de Radiotraitement, Centre National des Sciences et Technologies Nucléaires (CNSTN), Pôle Technologique de Sidi Thabet, 2020 Tunis, Tunisia

Received 11 December 2011; Accepted 2 January 2012

Academic Editors: J. M. Saniger and M. Soylak

Copyright © 2012 Hassouna Dhaouadi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Mn3O4 nanoparticles were prepared by a simple chemical route using cetyltetramethylammonium bromide (CTAB) as a template agent. Mn3O4 nanocrystals present an octahedral shape, and their crystallite size varies between 20 and 80 nm. They were characterized by XRD, SEM, DTA/TG, and IR spectroscopy. XRD studies confirm the presence of a highly crystalline Mn3O4 phase. The Rietveld refinement of the X-ray diffraction data confirms that Mn3O4 nanoparticles crystallize in the tetragonal system with space group I41/amd. DTA/TG and XRD measurements demonstrate the phase transition toward a spinel structure between 25 and 700C. The electrical conductivity increases between 80 and 300C, suggesting a semiconducting behaviour of Mn3O4. Both dielectric dispersion (ε′) and dielectric loss (ε′′) were investigated from 80 and 300C in the frequency range of 10 Hz–13 MHz. The dielectric properties showed typical dielectric dispersion based on the Maxwell-Wagner model.