Low temperature sintering and microwave dielectric properties of Li3Mg2NbO6 ceramics for LTCC application

TLDR: Li et al. as mentioned in this paper investigated the influence of ZBS additives on phase composition, sintering behavior, microstructure and microwave dielectric properties of Li3Mg2NbO6 ceramics.

Abstract: The Li3Mg2NbO6 ceramics doped with ZnO-B2O3-SiO2 (ZBS) additives were synthesized via the conventional solid-state reaction process. The influence of ZBS additives on phase composition, sintering behavior, microstructure and microwave dielectric properties of Li3Mg2NbO6 ceramics were investigated in detail. The XRD patterns showed that the sintered specimen presented a single phase and no secondary phase appeared. We found that proper amount of ZBS additives could significantly reduce the sintering temperature from 1250 to 925 °C and promote the densification of Li3Mg2NbO6 ceramics. The er and Q × f value were strongly affected by bulk density and grain size, respectively. As ZBS content increased, the τf value shifted toward negative direction. In summary, excellent microwave dielectric properties of er ~ 14.84, Q × f ~ 73,987 GHz, τf ~ −16.05 ppm/°C could be obtained in 0.5 wt.% ZBS modified sample when sintered at 925 °C for 4 h. Furthermore, the material was compatible with Ag electrode, demonstrating that it would be a promising candidate material for LTCC application.