Giant dielectric permittivity and dielectric relaxation behaviour in (Fe1/2Nb1/2)(x)Ti1-xO2 ceramics

摘要

In this work, the giant dielectric properties and dielectric relaxation behaviour in (Fe1/2Nb1/2)(x)Ti1-xO2 (x = 0-0.1) ceramics prepared by a conventional solid state reaction method were investigated. Pure phase of nitile-TiO2 was obtained in all ceramic compositions. Dense ceramic microstructure without porosity was achieved in the sintered ceramics. High dielectric permittivity of 10(3) was obtained. The existence of Ti4+ and Ti3+ was confirmed by X-ray photoelectron spectroscopy. The thermally activated dielectric relaxation behaviour in (Fe1/2Nb1/2)(x)Ti1/2O2 ceramics was observed and attributed to the electron hopping mechanism.