MgTiO3基微波介质陶瓷的制备及介电性能的研究

摘要

以分析纯的MgO、TiO2、SrCO3为原料，采用固相反应法制备(1-x)MgTiO3-xSrTiO3(MST, x=0.36-0.41)系列微波介质陶瓷材料，研究添加SrTiO3后，体系的致密度、晶相组成、显微结构、微波介电性能之间的变化规律。结果表明，随着SrTiO3添加量的增加，陶瓷的相对密度、介电常数、都呈增加趋势，SrTiO3的加入量为41mol%，此时形成的MST陶瓷具有最优的介电性能，最优的致密度。%In this study, (1-x)MgTiO3-xSrTiO3 (MST, x=0.36~0.41) microwave dielectric ceramics were prepared by solid phase reaction method using MgO, TiO2 and SrCO3 as raw materials. The effects of SrTiO3 addition on the crystal structure, microstructure and microwave dielectric properties of the ceramic were investigated. The results show that with the SrTiO3 additive content increasing, the volume density and the dielectric constantεr increased. When the doping amount of SrTiO3 is 41mol%, the as-prepared ceramic can obtain the best dielectric properties and volume density.