Dielectric properties of (Zn1-xMgx)TiO3 ceramics and the modulation effect of TiO2

摘要

Microwave ceramics with good performances based on (ZnMg)TiO3-TiO2 system were developed and prepared by conventional solid-state method. The influence of Zn:Mg ratio, calcination temperature, and TiO2 addition on the microstructures, crystal phases and microwave properties of (Zn1-xMgx)TiO3 (x = 0.1～0.5) was investigated. The results indicate that the sufficient addition of MgTiO3 can inhibit the decomposition of ZnTiO3 efficiently, and hexagonal single-phase (ZnMg)TiO3 host materials can be synthesized in the wide temperature range. Due to the compensation effect of TiO2 for τ f of host materials, microwave properties of (Zn1-xMgx)TiO3 were improved significantly. (Zn0.65Mg0.35TiO3 ceramics doped 10～15wt% TiO2 with excellent microwave properties of ε = 27～33, τ f ≈±10 ppm/°C,Q×f > 70,000 (10GHz) were obtained finally.