【摘要】 采用固相法制备了添加Bi4Ti3O12(BIT)的(Ba0.71Sr0.29)TiO3(BST)陶瓷,研究了BIT的加入量对所制BST陶瓷的微观结构和介电性能的影响。结果表明:随着BIT添加量的增加,BST陶瓷的晶粒尺寸先减小后增大,相对介电常数(εr)逐渐减小,介质损耗(tanδ)先减小后增大。当添加质量分数26%的BIT于1 120℃烧结,制得的BST陶瓷综合性能较好:εr为1 700,tanδ为0.006,容温特性符合X7R的要求,耐直流电压强度为5.0×103V/mm。更多还原

【Abstract】 Bi4Ti3O12(BIT) added(Ba0.71Sr0.29)TiO3(BST) ceramics were prepared by solid state method.Effects of BIT adding amount on the dielectric properties and microstructure of prepared BST ceramics were investigated.The results show that the crystal grain size decreases first and then increases,the relative permittivity(εr) decreases,the dielectric loss(tanδ) decreases first and then increases when BIT adding amount incerases.The BST ceramics prepared with mass fraction of 26% of BIT and sintered at 1 120 ℃ possess good comprehensive properties: εr of 1 700,tanδ of 0.006.The capacitance temperature property of the BST ceramics is suited for X7R,and the DC withstand voltage strength is 5.0×103 V/mm.更多还原