SnO_2对锂铌钛系微波介电陶瓷性能的影响

用SnO2作为掺杂剂对LiNb0.6Ti0.5–xSnxO3陶瓷进行改性,研究了SnO2添加量对LiNb0.6Ti0.5O3锂铌钛体系陶瓷的烧结性能,显微结构和微波介电性能的影响。结果表明:随着SnO2添加量的增加,陶瓷体密度和介电常数基本保持不变;而Q·f值随SnO2的加入有所提高,而后随SnO2含量继续增加而快速下降;在1100℃的烧结温度下,当x为0.01时,获得微波介电性能优良的微波陶瓷,其εr为67.8,τf为+4×10–6/℃,Q·f为6780GHz。

Effect of SnO2 on microwave dielectric properties of LiNb0.6Ti0.5-xSnxO3 ceramics

The SnO2 was introduced into the LiNb0.6Ti0.5–xSnxO3 ceramic as dopant. The effects on sintering performance, microstructure and microwave dielectric properties with different amount of SnO2 in the LiNb0.6Ti0.5–xSnxO3 ceramic were investigated. The results indicate that the density and dielectric constant remains steadily when doping SnO2. The Q·f value increased with the doping of SnO2 but decreased quickly with larger amount of additives. The dielectric properties εr=67.8,τf =4× 10–6/℃,Q·f = 6 780 GHz were obtained for the ceramics when x = 0.01 and the sintering temperature is at 1 100 ℃ .