Microwave dielectric properties and sintering behaviors of (Mg0.95Ni0.05)TiO3-CaTiO3 ceramic system

The microwave dielectric properties and sintering behaviors of the new ceramic system (1 − x)(Mg0.95Ni0.05)TiO3-xCaTiO3 (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, (Mg0.95Ni0.05)TiO3 and CaTiO3, and a second phase (Mg0.95Ni0.05)Ti2O5, which was favorable at high temperatures. The two-phased system was confirmed by both XRD and EDS analysis. Zero τf can be achieved by appropriately adjusting the compositional ratio. Specimen with x = 0.06 possessed an excellent combination of microwave dielectric properties: ɛr ∼ 20.8, Q × f ∼ 79,200 GHz and τf ∼ 1.2 ppm/°C. It is proposed as a candidate material for GPS patch antennas and ISM band filters.