Diffuse Phase Transition of Ba_0.92Ca_0.08(Ti_0.82Zr_0.18)O₃Based Ceramics

Abstract

Abstract Ba0.9175Ca0.08Nd0.0025(Zr0.18Ti0.8175-xYxMn0.0025)O3(x = 0, 0.5%, 0.75%, 1.0%, 1.5% and 2.0% mol) ceramics are synthesized by the conventional solid state processing. X-ray diffraction patterns show that all the compositions have an only tetragonal BaTiO3 structure at room temperature. The dielectric constant of samples decrease, dielectric peak temperature (Tm ) shifts toward lower temperature and the frequency dispersion becomes strong and the more pronounced DPT (Diffuse Phase Transitions) behavior as the content of Y increases. The degree of deviation from the Curie–Weiss law is found to increase and the value of the parameter γ is from 1.82 to 1.96 with the increasing amount of Y3+. Keywords: Ceramicsdielectric propertiesrelaxor behaviordiffuse phase transition Acknowledgments The work was supported by National Natural Science Foundation of China under Grant No 11074203; Key Disciplinary of Materials Science under Grant No XZD0814-09-1, the talents foundation of Xihua University under Grant No R0620109 and the Graduate Innovation Foundation of Xihua University under Grant No. YCJJ201152 and YCJJ201257.