Microwave dielectric properties of Ba(Co0.47+xY0.04Zn0.35)1/3Nb2/3–0.05O3 (x = 0–0.13) ceramics

The sintering behaviors and microwave dielectric properties of Ba(Co0.47+xY0.04Zn0.35)1/3Nb2/3–0.05O3 (x = 0–0.13) ceramics were investigated in this paper. The XRD results showed all samples exhibited the main phase Ba(Co1/3Nb2/3)O3–Ba(Zn1/3Nb2/3)O3 (BCZN) and a certain amount of secondary phase Ba5Nb4O15. SEM revealed that the microstructure was homogeneous fine grained when x equaled to 0.13. The Co deficiency was found unfavorable to improve the microwave dielectric properties of BCZN ceramics and showed remarkable influence on crystal phases and microstructures. The relatively optimized microwave dielectric properties could be obtained when Co was adequate. At last, the Ba(Co0.6Y0.04Zn0.35)1/3Nb2/3–0.05O3 ceramics well-sintered at 1340°C for 20 h had good microwave dielectric properties of εr = 35.0, Q×f = 44,833 GHz and τf = −1.1 ppm/°C.