Preparation and Microwave Dielectric Properties of (1-x)Ca_(2/5)Sm_(2/5)TiO_3-x Li_(1/2)Nd_(1/2)TiO_3 Ceramics

摘要

((1-x)Ca_(2/5)Sm_(2/5)TiO_3-x Li_(1/2)Nd_(1/2)TiO_3 (CSLNT) ceramics, suitable for use in resonators or filters at microwave frequency, have a high epsilon_r and a low temperature coefficient of resonant frequency. The effects of calcinations on the microwave dielectric properties of CSLNT were studied. The CSLNT (x = 0.3) ceramics sintered at 1300 deg C for 3 h showed microwave properties with epsilon_r of 92, Qf of 5060 GHz and tau_f of 7.5 ppm/ deg C. The microwave dielectric properties of CSLNT (x = 0.3) ceramics were also improved by soft chemistry methods such as citric acid gel route and ethylenediaminetetraacetic acid (EDTA) chelating method. The excellent microwave properties with epsilon_r= 96, Qf = 6290 GHz and tau_f- 6 ppm/ deg C were obtained by EDTA chelating method for CSLNT (x = 0.3) ceramics.