Preparation, properties and characterization of CaTiO3-modified Pb(Fe1/2Nb1/2)O3 dielectrics

CaTiO3 modified Pb(Fe1/2Nb1/2)O3 dielectrics were prepared by a solid-state reaction process and the structure analysis was performed together with the dielectric characterization. The cubic perovskite structures were identified by X-ray diffraction for all compositions in the present system. The short-range order in the dielectrics was revealed by the Raman spectroscopy as the complementarities of XRD. The Raman spectra showed structure transition with the CaTiO3 content increasing to 0.9. The effects of incorporating CaTiO3 on the dielectric properties of Pb(Fe1/2Nb1/2)O3 dielectrics were connected to the shifting curie temperature to the low temperature side and the structure transition. Low loss dielectrics with reduced temperature coefficient and high dielectric constant were obtained in the present system, and good microwave dielectric properties (ε=164, Qf=6 180GHz, τf=+583ppm/°C) were obtained in the present modified dielectrics.