Improved temperature stability of Li3Mg2NbO6 microwave dielectric ceramics by using CaTiO3 additives

Niobate-based microwave ceramics with low loss are expected to be used in 5G communication devices such as antennas, resonators and dielectric filters. In order to obtain a thermally-stable dielectric ceramic, (1-x)Li3Mg2NbO6-xCaTiO3-4wt%LiF system were fabricated. The results of crystal structure and microstructure showed specimens possessed a two phase system with Li3Mg2NbO6 and CaNbO3. The microstructure and dielectric performances of niobate-based ceramics are closely related to the amount of CaTiO3 added. An optimum dielectric property of εr ∼15.8, Q × f ∼84430 GHz and τf ∼6.5 ppm/°C was obtained at 1050 °C for 0.925Li3Mg2NbO6-0.075CaTiO3-4wt%LiF ceramic. •Temperature stable of Li3Mg2NbO6-based ceramics was fabricated.•The sintering temperature is 1050 °C.•CaTiO3 additives improved dielectric properties.•Optimal properties of εr ∼15.8, Q×f ∼84430 GHz, and τf ∼6 ppm/°C were acquired.•Which is an alternative material for communication components.