Crystal structure and microwave dielectric properties of Ca(Li_(1/3)Nb_(2/3))_(0.92)Zr_(0.08)O_(3.δ)-xTi0_2 ceramics

摘要

Crystal structure and microwave dielectric properties of Ca[(Li_(1/3)Nb_(2/3))_(0.92)Zr_(0.08)]O_(3.δ)-xTi0_2 (0≤x≤0.2) ceramics were investigated. A single phase with orthorhombic perovskite structure was obtained at x=0.0~0.1. With an increasing of Ti~(4+) content, the Qf value decreased due to a decrease of the degree of B-site 1:2 ordering. However, the if value firstly increased from-14.2ppm °C to -6.6ppm/°C, and then moved to the negative direction. When x=0.05, the optimum microwave dielectric properties: ε_r=32.8, Qf=19460GHz and tf=-8.3 ppm/°C.