Microwave dielectric characteristics of ceramics in Mg2SiO4–Zn2SiO4 system

(Mg1−xZnx)2SiO4 ceramics were prepared and characterized. The densification temperatures of the present ceramics are much lower than those for Mg2SiO4 and Zn2SiO4 end-members. Small solid solution limits of Zn in Mg2SiO4 and Mg in Zn2SiO4 are observed, and the bi-phase structure is confirmed in (Mg1−xZnx)2SiO4 ceramics with x = 0.1–0.9. Even though, it is clear that the Qf value of Zn2SiO4 ceramics can be significantly improved together with a suppressed temperature coefficient of resonant frequency τf by substituting Mg for Zn. (Mg0.4Zn0.6)2SiO4 ceramics indicate a good combination of microwave dielectric characteristics: ɛr = 6.6 Qf = 95,650 GHz, and τf = −60 ppm/°C.