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

Abstract

In order to tailor the microwave dielectric performances of Mg(Nb0.98Ti0.01W0.01)2O6–TiO2 composite ceramics, Mg(Nb0.98Ti0.01W0.01)2O6–Mg doped TiO2–Mg(Nb0.98Ti0.01W0.01)2O6 and Mg(Nb0.98Ti0.01W0.01)2O6–TiO2–Mg(Nb0.98Ti0.01W0.01)2O6 tri-layer architectural ceramics with different volume fractions and different TiO2 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 TiO2 interlayer can be increased by nearly 33 % compared with that of the pure TiO2 interlayer. The Mg(Nb0.98Ti0.01W0.01)2O6–Mg doped TiO2–Mg(Nb0.98Ti0.01W0.01)2O6 tri-layer ceramics exhibit remarkably outstanding dielectric performances: εr = 27.5, Q×f = 72,148 GHz, and τf = +6.37 ppm/°C with 0.03 wt% Mg doped TiO2 sintered at 1340 °C for 6 h to achieve a comprehensive optimization of microwave dielectric performances.