Enhanced the temperature stability of low-fired Li₃Mg₂NbO₆ microwave dielectric ceramics for LTCC application

The temperature stability of low-fired (1−x)Li₃Mg₂NbO₆-xLa_0.5Na_0.5TiO₃-6wt% LiF ceramics (x = 0.025, 0.050, 0.075, 0.100) were fabricated in an effort to develop a low-temperature co-fired microwave communication material. The sintered samples had a primary phase of Li₃Mg₂NbO₆ and a secondary phase of La_0.5Na_0.5TiO₃. The addition of La_0.5Na_0.5TiO₃ additive significantly enhances the dielectric properties of Li₃Mg₂NbO₆ ceramics. After sintering at 925 °C for 6 h, 0.95Li₃Mg₂NbO₆-0.05La_0.5Na_0.5TiO₃-6wt% LiF ceramics showed a dielectric performance: the ε_r value of 14.9, Q × f of 51,888 GHz, and the τ_f value of − 4.77 ppm/°C. The samples displayed well compatibility with the silver electrodes. It is promised to become a new material in microwave communication and has potential applications in low-temperature co-firing ceramics (LTCC).