x%V_2O_5+1.5%Li_2CO_3共掺杂Mg_4Nb_2O_9陶瓷低温烧结及其微波介电性能

Low Temperature Sintering and Microwave Dielectric Properties of Mg_4Nb_2O_9 Ceramics by Adding x%V_2O_5+1.5%Li_2CO_3

采用机械合金法制备了Mg4Nb2O9微波介质陶瓷,研究了添加V2O5和Li2CO3对其烧结性能、显微结构及微波介电性能的影响。结果表明:添加V2O5和Li2CO3可有效降低Mg4Nb2O9陶瓷烧结温度(940℃),获得亚微米级(0.86μm)微波介质陶瓷。1.50%V2O5和1.50%Li2CO3(质量分数)共掺杂Mg4Nb2O9陶瓷于940℃烧结获得良好微波介电性能:介电常数为12.7,品质因数为45028GHz,谐振频率温度系数为-7.65×10-5℃-1,有望成为新一代低温烧结基板材料。

Mg4 Nb2 O9 microwave dielectric ceramics were prepared by mechanical alloying method. The effects of V2O5 and Li2CO3 additions on the sintering ability, microstructure and microwave dielectric properties of Mg4 Nb2 09 ceramics were investigated. The results show that, the sintering temperature of Mg4 Nb2 O9 ceramics can be effectively decreased to 940 ℃ by adding V205 and Li2CO3, the average grain size was 0. 86 μm. The Mg4Nb2O9 ceramics co-doped 1.50 wt% V2Os and 1.50 wt% Li2CO3 sintered at 940 ℃ has good microwave dielectric properties such as dielectric constant 12.7, quality factor 45028 GHz and resonant frequency temperature coefficient --7. 65 ）〈 10^-5 ℃ 2. It is expected to become a new generation of low-temperature sintering substrate material.