Abstract
Low-loss ceramics (Zn0.3Co0.7)Ti1−xSnxO3 (ZCTS) (x = 0, 0.02, 0.05, 0.09, 0.14) were prepared by the conventional solid-state route. The effects of Sn ratio on phase composition, microstructure, and the microwave dielectric properties of (Zn0.3Co0.7)Ti1−xSnxO3 materials were investigated using X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy (EDS). The results revealed that the ZCTS (x = 0.02, 0.05, 0.09, 0.14) composites consisted of three crystalline phases: ZnTiO3-type phase, Zn2TiO4-type phase, and TiO2 phase. Due to the compensating effect of rutile TiO2, the temperature coefficient of resonant frequency (τf) for (Zn0.3Co0.7)Ti1−xSnxO3 (x = 0.02) ceramic was tuned to near zero value. It was found in our experiment that with the increase of Sn ratio, the microwave dielectrics showed a great promotion in Q × f when Ti4+ was partially substituted by Sn4+. Typically, the (Zn0.3Co0.7)Ti1−xSnxO3 (x = 0.02) ceramic sintered at 1,220 °C for 4 h exhibited good microwave dielectric properties of er = 24, Q × f = 66,700 GHz and τf = −5.43 ppm/°C.
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