Microwave and terahertz dielectric properties of MgTiO3–CaTiO3 ceramics

The THz dielectric properties of MgTiO3–CaTiO3 ceramics are reported. The ceramics were prepared via a solid-state reaction route and the sintering conditions were optimized to obtain ceramics with high permittivity and low loss in the terahertz frequency domain. The amount of impurities (MgTi2O5) and grain size increased with increasing sintering temperature. The dielectric properties improved with increasing density, and the best terahertz dielectric performance was obtained at 1260°C, with a permittivity of 17.73 and loss of 3.07×10−3. Ceramics sintered above 1260°C showed a sharp increase in loss, which is ascribed to an increase in the impurity content. •Dense ceramics of 0.95MgTiO3–0.05CaTiO3 with different grain sizes were prepared.•Optimized THz properties were obtained for ceramics sintered at 1260°C.•Optimized properties were attributed to high density and high purity of ceramics.