Li含量对M相Li2O-Nb2O5-TiO2陶瓷微波介电性能的影响

In this paper, the effects of excess Li content on the phase structure and microwave dielectric properties, especially on the temperature coefficient, of the LiNb0.6Ti0.5O3 (LNT) ceramics were studied. The results show that small amount of Li effectively enhanced the sintering process due to the compensation ofc high volatility of Li, leading to a densification and homogenous microstructure, and therefore enhanced the dielectric properties. However, too much Li would lead to a secondary phase and cause the abnormal grain growth. The LNT + 5 wt% Li ceramic sintered at 1075℃ in the air shows the best properties of : εr = 69.73,Q × f = 5543 GHz, τf = -4.4 ppm /℃。