Enhanced temperature stability of Li₃Mg₂NbO₆-based ceramics by using LTC composite additives

The need for microwave dielectric ceramics is steadily growing along with the rapid advancement of wireless communication technology. The preparation of Li₃Mg₂NbO₆-xwt% LiF-TiO₂-CaF₂ (LMN-LTC, x = 4, 6, 8, 10) ceramics was carried out using the solid-state reaction method. The two-phase structure of the LMN-LTC ceramics was shown by XRD investigation, with the main phase being LMN and the second phase Ca(TiO₃). Due to the influence of additive LTC, the microwave dielectric properties of the LMN ceramics, especially the temperature stability were successfully regulated to near zero. The LMN ceramic with the addition of 6wt% LTC sintered at 1050 °C for 6 h exhibits outstanding microwave dielectric properties: ε_r = 13.0, Q × f = 42,000 GHz, τ_f = 1.76 ppm/°C. It is shown that LMN-6wt% LTC ceramic is promising for wireless communication applications.