采用固相法,利用X-射线衍射(XRD)、扫描电镜(SEM)等测试分析方法系统研究了Bi4Ti3O12掺杂量(质量分数,下同)(18%~50%)对(Ba0.71Sr0.29)TiO3 (BST)基电容器陶瓷介电性能和结构及烧结温度的影响.研究结果表明:随着Bi4Ti3O12掺杂量的增加,BST陶瓷的晶粒尺寸先减小然后增大.在BhTi3O12掺杂量的范围内,BST陶瓷的物相均为Bi4Ti3O12和BST的混合相,随着Bi4Ti3O12掺杂量的增加,Bi4Ti3O12相逐渐增多.随着Bi4Ti3O12掺杂量的增加,BST陶瓷的介电常数(ε)逐渐减小;介质损耗(tarδ)均较小(0.0050~0.0075),呈先减小后增大的趋势;烧结温度逐渐降低,当Bi4Ti3O12掺杂量为50%时,烧结温度为1090℃.随着Bi4Ti3O12掺杂量的增加,BST陶瓷的容温变化率(AC/C)绝对值在正温范围内(25~125℃)逐渐减小,容温变化率(△C/C)在负温范围内(-55~25℃)先减小然后上升再下降.当Bi4Ti3O12掺杂量为26%时,BST陶瓷综合性能较好,其介电常数为1700,介质损耗为0.006,容温变化率的绝对值小于15%(-55~125℃),符合X7R特性,耐直流电压为5.0kV/mm,烧结温度为1120℃.
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