Dielectric properties of iron doped calcium copper titanate, CaCu 3Ti 3.9Fe 0.1O 12 ceramic

Abstract

Dielectric properties of iron doped CaCu 3-Ti 4O 12 (CCTO), viz. CaCu 3Ti 3.9Fe 0.1O 12 (CCTFO) prepared by a novel semi-wet route have been investigated. X-ray diffraction of powder sintered at 900 °C show formation of single phase solid solution. Energy dispersive X-ray spectroscopy (EDX) confirmed the presence of CuO rich phase at grain boundaries of CCTFO. Nature of dielectric relaxation observed above room temperature is studied using complex plane impedance analysis and modulus spectroscopy. It has been found that out of the two relaxations reported earlier above room temperature, one occurring at lower temperature is due to grainboundaries interfacial polarization. © Springer Science+Business Media, LLC 2011.