Microwave dielectric properties and sintering behaviors of (Mg_(0.95)Ni_(0.05))TiO_3-CaTiO_3 ceramic system

摘要

The microwave dielectric properties and sintering behaviors of the new ceramic system (1 -x)(Mg_(0.95)Ni_(0.05))TiO_3-xCaTiO_3 (x <= 0.1) prepared by conventional solid state route were investigated. The compositions with x = 0.02-0.1 resulted in the mixture of two main phases, (Mg_(0.95)Ni_(0.05))TiO_3 and CaTiO_3, and a second phase (Mg_(0.95)Ni_(0.05))Ti_2O_5, which was favorable at high temperatures. The two-phased system was confirmed by both XRD and EDS analysis. Zero tau_f can be achieved by appropriately adjusting the compositional ratio. Specimen with x = 0.06 possessed an excellent combination of microwave dielectric properties: epsilon_r approx 20.8, Q x f approx 79,200 GHz and tau_f approx 1.2ppm/C. It is proposed as a candidate material for GPS patch antennas and ISM band filters.