Low loss dielectric material system of (1 − x)(Mg_0.95Co_0.05)₂(Ti_0.95Sn_0.05)O₄–x(Ca_0.8Sm_0.4/3)TiO₃ at microwave frequency with a near-zero temperature coefficient of the resonant frequency

抄録

High-quality (1 − x)(Mg_0.95Co_0.05)₂(Ti_0.95Sn_0.05)O₄–x(Ca_0.8Sm_0.4/3)TiO₃ ceramics were prepared by solid-state reaction. The products were characterized by scanning electron microscopy, X-ray diffraction, and network analyzer. (Mg_0.95Co_0.05)₂(Ti_0.95Sn_0.05)O₄ (MCTS) has a dielectric constant (ε_r) of ∼14.7, a high quality factor (Q×f) of ∼330,134 GHz, and a temperature coefficient of resonant frequency (τ_f) of ∼−46 ppm/°C. To produce a temperature-stable material, (Ca_0.8Sm_0.4/3)TiO₃ (CST) which has a large positive value τ_f of +400 ppm/°C, was added to MCTS. 0.84 MCTS–0.16CSTs an excellent combination of microwave dielectric properties: ε_r ∼ 22.5, Q×f ∼ 206,000 GHz (at 9 GHz), and τ_f ∼ −0 ppm/°C sinter at 1325°C, and can be utilized in the fabrication of microwave devices.