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采用常规电子陶瓷工艺方法制备不同Ba/Sr比的Ba_xSr_(1-x)TiO_3-Mg_2TiO_4复合陶瓷,利用XRD、SEM、EDS及介电性能测试手段研究Ba/Sr比对复合陶瓷相结构及介电性能的影响。结果表明:制备的复合陶瓷由Ba_xSr_(1-x)TiO_3和Mg_2TiO_4两相组成,没有其他杂相出现;随着Ba/Sr比的减小,材料居里转变温度Tc向低温移动,室温介电常数、介电损耗和介电常数可调度均减小,而材料的优化因子却增大。组成为30%Ba_(0.45)Sr_(0.55)TiO_3-70%Mg_2TiO_4的复合陶瓷综合介电性能最优,在25℃、10k Hz条件下测得该陶瓷的介电常数为76.5,介电损耗为0.000 7,材料的介电可调度为10.2%(电场强度为2 kV/mm),适用于制作微波可调谐器件。
Ba_xSr_ (1-x) TiO_3-Mg_2TiO_4 composite ceramics with different Ba / Sr ratios were prepared by conventional electronic ceramic technology. The phase structure of Ba / Sr composite ceramics and the dielectric properties of Ba / Sr composite ceramics were studied by XRD, SEM, EDS and dielectric properties. The impact of performance. The results show that the composite ceramic is composed of two phases of Ba_xSr_ (1-x) TiO_3 and Mg_2TiO_4, and no other miscellaneous phases appear. With the decrease of Ba / Sr ratio, the Curie transition temperature Tc moves to low temperature, The constants, dielectric loss and permittivity schedulability are reduced, while the material optimization factor is increased. The composite ceramics with the composition of 30% Ba 0.45 Sr 0.55 TiO 3-70% Mg 2 Ti 4 O 4 have the best dielectric properties, the dielectric constant is 76.5 at 25 ℃ and 10k Hz, the dielectric loss is 0.000 7, dielectric material can be scheduled for 10.2% (electric field strength of 2 kV / mm), suitable for the production of microwave tunable devices.