Structure and electrical properties of Co0.5CdxFe2.5-xO4 ferrites

• Published in: Journal of alloys and compounds 2008-09, Vol.464 (1-2), p.361-369
• Main Authors: FAREA, A. M. M, KUMAR, Shalendra, KHALID MUJASAM BATOO, YOUSEF, Ali, CHAN GYU LEE, ALIMUDDIN
• Format: Article
• Language: English
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Dielectric breakdown and space-charge effects; Dielectric properties of solids and liquids; Dielectrics, piezoelectrics, and ferroelectrics and their properties; Exact sciences and technology; Permittivity (dielectric function); Physics
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2007.09.126

We have studied the Cd ion doping effects in cobalt ferrite using X-ray diffraction (XRD), dielectric and impendence spectroscopy at room temperature. X-ray diffraction analysis indicates that all the samples exhibit a single phase nature with cubic spinel structure. The dielectric constant ', '', loss tangent tan delta and ac conductivity sigmaac have been studied as a function of frequency and composition. It is observed that doping of the Cd ions increases ', '', tan delta and sigmaac up to 20% after that it start decreasing with further doping. The dielectric properties and ac conductivity in studied samples have been explained on the basis of space charge polarization according to Maxwell and Wagner's two-layer model and the hoping between adjacent Fe2+ and Fe3+ as well as the hole hopping between Co3+and Co2+ ions at B-sites. The complex impedance analysis used to separate the grain and grain boundary of the system Co0.5CdxFe2.5-xO4.