Abstract
The microwave dielectric properties and microstructure of a two-phase (Mg0.95Zn0.05)2TiO4–CaTiO3 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(Mg0.95Zn0.05)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 ∼153,000 GHz (at 10 GHz), and a temperature coefficient of resonant frequency (τf) of ∼ -16.82 ppm/°C. The τf value is strongly correlated to the composition and can be controlled by the compositional ratio. At x = 0.1, an εr of ∼19.15, a Q ×f value of ∼94,400 GHz (at 10 GHz), and a τf of ∼1.5 ppm/°C were obtained for 0.9(Mg0.95Zn0.05)2TiO4–0.1CaTiO3 ceramic sintered at 1270 °C for 4 h.
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