CAO Liangzu ¹, WANG Liya ², YIN Lixia ¹

(1. Jingdezhen Ceramic Institute, Jingdezhen 333403, Jiangxi, China; 2. Jingdezhen University, Jingdezhen 333000, Jiangxi, China)

Abstract: Effects of MnO₂ (0-0.2wt.%) on structure and dielectric properties of (Zr_0.8Sn_0.2)Ti_1+δO_4+2δ (ZST, δ = -0.2-0.2) ceramics have been studied. The ZST ceramics were prepared by using the conventional solid-state reaction method. Crystalline phases and microstructures of the ZST samples were analyzed by using XRD, SEM, while their dielectric properties were characterized by using a parallel plate resonator method. Without the addition of MnO₂, the ZST samples (δ≠0) contain second phases and dielectric properties of the sample with δ=0.2 is the worst. With the addition of 0.2wt.% MnO₂, the dielectric properties of the ZST with δ=0.2 were greatly improved. Specifically, the Q×f value is increased to 43.63 THz from 25.40 THz and the frequency temperature coefficient is decreased to 16.8 ppm/℃ from 39.0 ppm/℃.
Key words: (Zr_0.8Sn_0.2) Ti_1+δO_4+2δ ceramics; MnO₂ doping; microwave dielectric property