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 ε_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℃ for 3 h showed microwave properties with ε_r of 92, Qf of 5060 GHz and τ_f of 7.5 ppm/℃. 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 ε_r = 96, Qf = 6290 GHz and τ_f = 6 ppm/℃ were obtained by EDTA chelating method for CSLNT (x = 0.3) ceramics.