Ba_(0.8)Mg_(0.2)V_2O_6陶瓷微波介电性能研究

On microwave dielectric properties of Ba_(0.8)Mg_(0.2)V_2O_6 ceramic

采用传统固相反应法制备Ba_(0.8)Mg_(0.2)V_2O_6陶瓷,研究部分Mg^(2+)离子取代Ba^(2+)离子对Ba_(0.8)Mg_(0.2)V_2O_6陶瓷烧结特性、晶体结构、显微组织和微波介电性能的影响。采用XRD、SEM及矢量网络分析仪对其晶体结构、显微组织和微波介电性能进行表征。XRD结果显示样品主相为正交结构BaV_2O_6相。微波介电性能实验结果表明,随着烧结温度升高,样品ε_r和Q×f值均先增加后降低;部分Mg^(2+)离子取代Ba^(2+)离子能有效调节BaV_2O_6基陶瓷τf值。当500℃、5h烧结Ba_(0.8)Mg_(0.2)V_2O_6时,具有最佳微波介电性能。

The Ba0.8 Mg0.2 V206 ceramics are prepared by a solid-state reaction method, and the influences of partial Mg^2＋ substitution for Ba^2＋ on the sinterability, crystal structure, micro- structure and microwave dielectric properties of Ba0.8 Mg0.2 V2O6 ceramics are investigated. The crystal structure, microstructure and microwave dielectric properties are studied by using XRD, SEM and network analyzer. XRD results reveal that major phase BaV2O6 is obtained with orthorhombic structure. It is also found that both the ε and Q×f vales is increased first and then declined with increasing firing temperature, and the r/value of BaVzO6-based ceramic could be tuned by partial Mg^2＋ ion substitution for Ba^2＋ ion. Typically, good microwave dielectric properties ceramics sintered at 550℃ for 5 h can be obtained.