The microwave dielectric properties and microstructure of a two-phase (Mg0.95Zn0.05)2TiO4-CaTiO 3 ceramic system prepared using the conventional solid-state route were investigated. The structure and microstructure were analyzed by X-ray diffraction and scanning electron microscopy, respectively. Ilmenite-structured (Mg0.95Zn0.05)TiO3 was detected as a second phase. The coexistence of the second phase, however, did not degrade the dielectric properties of the specimen because the phases were compatible. At 1270°C, 0.92(Mg0.95-Zn0.05)2TiO4-0. 08CaTiO3 ceramic showed a good combination of microwave dielectric properties: a dielectric constant (εr) of -18.03, a quality factor (Q × f) value of -153,000GHz (at 10GHz), and a temperature coefficient of resonant frequency (τf) of -16.82ppm/°C. The τf value is strongly correlated to the composition and can be controlled by the compositional ratio. Atx = 0.1, an εr of -19.15, a Q × f value of -94,400GHz (at 10 GHz), and a τf of -1.5ppm/°C were obtained for 0.9(Mg0.95Zn0.05) 2TiO4-0.1CaTiO3 ceramic sintered at 1270°C for 4h.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)