Low‐Loss Microwave Dielectrics in the (Mg 1− x Zn x ) 2 TiO 4 Ceramics

The microwave dielectric properties and the microstructures of (Mg 1− x Zn x ) 2 TiO 4 ceramics prepared by the conventional solid‐state route were investigated. Lattice parameters were also measured for samples with different x . As x increased from 0 to 0.05, the Q × f of the specimen can be promoted from 150 000 GHz to a maximum 275 300 GHz. It also showed a remarkable lowering in the sintering temperature (∼100°C). Ilmenite‐structured (Mg 0.95 Zn 0.05 )TiO 3 was detected as a second phase. The coexistence of the second phase, however, is not harmful to the dielectric properties of the specimen because it possesses compatible ones. A fine combination of microwave dielectric properties (ɛ r ∼15.48, Q × f ∼275 300 GHz, τ f ∼−34 ppm/°C) was obtained for (Mg 0.95 Zn 0.05 ) 2 TiO 4 specimen sintered at 1330°C for 4 h. It is proposed as a very promising dielectric material for low‐loss microwave and millimeter wave applications.