Crystal structure and microwave dielectric properties of Ca[(Li_(1/3)Nb_(2/3)) _(0.92)Zr_(0.08)]O_(3-δ)-xTiO_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)-xTiO_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 τt value firstly increased from-14.2ppm /℃ to -6.6ppm/℃, and then moved to the negative direction. When x=0.05, the optimum microwave dielectric properties: εr=32.8, Qf = 19460GHz and τf =-8.3 ppm/℃.