Enhanced electric field tunable dielectric properties of BaZr_xTi_(1-x)O_3 relaxor ferroelectrics

摘要

The environmental friendly lead-free perovskite BaZr_xTi_(1-x)O_3 (x=0.35, 0.40, and 0.45) relaxor ceramics are developed for the tunable microwave device applications such as tunable filters, phase shifters, antennas, etc. Electric field dependence of dielectric behavior of the ceramic samples has been studied in the temperature range from 300 to 15 K for the tunable dielectric devices. The results have been analyzed in relation to tunability (%) and K factor of the tunable dielectric materials. Very high tunability (～93%) as well as extremely high K factor (～468) has been achieved by manipulating the Zr:Ti concentration in BaZr_xTi_(1-x)O_3 ceramics.