掺钇(Ba,Sr,Ca)TiO3纳米粉体及细晶陶瓷的制备与性能  

Preparation and properties of Y^(3+)-doped (Ba, Sr, Ca)TiO_3 nanopowders and fine-grained ceramics

作　　者：杜锋涛[1] 程花蕾[1] 崔斌[1] 畅柱国[1] 杨爱武 

机构地区：[1]西北大学化学与材料科学学院合成与天然功能分子化学教育部重点实验室,陕西省物理无机化学重点实验室,陕西西安710069 [2]西安北方庆华机电集团有限公司,陕西西安710025

出　　处：《电子元件与材料》2010年第1期18-21,共4页Electronic Components And Materials

基　　金：陕西省教育厅2009年度科学研究计划资助项目(No.09JC01);陕西省“13115”科技创新工程重大科技专项资助(No.2007ZDKG-61);西北大学研究生交叉学科资助项目(No.07YJC07)

摘　　要：采用sol-gel法制备了Y3+掺杂Ba0.90Sr0.08Ca0.02TiO3(BSCT)纳米粉体及细晶陶瓷。通过TG-DTG、XRD、SEM和TEM对样品结构及形貌进行了表征,并测试了陶瓷的介电性能。研究表明,Y3+掺杂BSCT纳米粉体主要为立方相BaTiO3,烧结后陶瓷晶粒尺寸在0.68~2.24μm可控,Y3+掺杂可以抑制陶瓷晶粒的生长,使陶瓷的tC向低温方向移动。随Y3+掺杂量的增大,陶瓷的介电温谱εr-t趋于平缓,当x(Y3+)为7.0%时,陶瓷的室温εr大幅度提高到9 176。Y3＋-doped Ba0.90Sr0.08Ca0.02TiO3（BSCT） nanopowders and fine-grained ceramics were prepared via a sol-gel method.The structure and morphology of samples were characterized by TG-DTG,XRD,SEM and TEM,and the dielectric properties of prepared ceramics were also measured.The results show that the prepared nanopowders were mainly composed of cubic BaTiO3 phase.The grain size of prepared ceramics can be controlled between 0.68 μm and 2.24 μm.The grain growth of prepared ceramics can be inhibited and Curie temperature shifts to lower temperature.A relatively flat εr-t curve is obtained when the Y3＋-doping amount increases.εr of the ceramics at room temperature increases greatly to 9 176 when the x（Y3＋） is 7.0%.

关 键 词：Ba0.90Sr0.08Ca0.02TiO3 掺钇 细晶陶瓷 SOL-GEL法 介电性能 

分 类 号：O614[理学—无机化学]