Co-fired tri-layered Mg(Nb0.98Ti0.01W0.01)2O6–Mg doped TiO2–Mg(Nb0.98Ti0.01W0.01)2O6 ceramics with high temperature stability and low dielectric loss.

In order to tailor the microwave dielectric performances of Mg(Nb 0.98 Ti 0.01 W 0.01) 2 O 6 –TiO 2 composite ceramics, Mg(Nb 0.98 Ti 0.01 W 0.01) 2 O 6 –Mg doped TiO 2 –Mg(Nb 0.98 Ti 0.01 W 0.01) 2 O 6 and Mg(Nb 0.98 Ti 0.01 W 0.01) 2 O 6 –TiO 2 –Mg(Nb 0.98 Ti 0.01 W 0.01) 2 O 6 tri-layer architectural ceramics with different volume fractions and different TiO 2 doping were designed and prepared. This work systematically investigates the crystal structure and microwave dielectric performances of composite ceramics. Raman spectroscopy confirmed the formation of a solid solution at the interface. Raman spectroscopy were used to analyze the ion diffusion behavior at the interface. Based on the law of mixing for composites, the Q × f value of the tri-layer structural ceramics with Mg doped TiO 2 interlayer can be increased by nearly 33 % compared with that of the pure TiO 2 interlayer. The Mg(Nb 0.98 Ti 0.01 W 0.01) 2 O 6 –Mg doped TiO 2 –Mg(Nb 0.98 Ti 0.01 W 0.01) 2 O 6 tri-layer ceramics exhibit remarkably outstanding dielectric performances: ε r = 27.5, Q × f = 72,148 GHz, and τ f = +6.37 ppm/°C with 0.03 wt% Mg doped TiO 2 sintered at 1340 °C for 6 h to achieve a comprehensive optimization of microwave dielectric performances. [ABSTRACT FROM AUTHOR]