Synthesis, structural, dielectric and electrical impedance study of Pb(Cu1/3Nb2/3)O3

Lead copper niobate Pb(Cu1/3Nb2/3)O3 (PCN) prepared by the columbite precursor method and structurally characterized using X-ray diffraction analysis. The final phase X-ray diffraction diagram shows that final phase material has perovskite structure with pyrochlore phase. Temperature dependent of ɛ′ and ɛ″ shows that the compound exhibit dielectric anomaly in the studied temperature range. Impedance spectroscopy used to characterize the electrical behaviour. ac impedance spectrum results indicate that the relaxation mechanism of the material is temperature dependent and has dominant bulk contribution in different temperature ranges. Frequency dependence of the real (ɛ′) and imaginary (ɛ′′) part of the dielectric permittivity shows typical characteristic of ferroelectric materials. Temperature dependent of dc resistively shows that resistance decreases with the increase in temperature and follows Arrhenius behaviour in different temperature regions.