无铅高居里点BaTiO_3-Bi_(0.5)K_(0.5)TiO_3陶瓷的制备及其PTC性能的研究  

Preparation and PTC Behavior of Lead Free High Curie Temperature BaTiO_3-Bi_(0.5)K_(0.5)TiO_3 Ceramics

作　　者：韦继锋[1] 蒲永平[1,2] 毛玉琴[1] 

机构地区：[1]陕西科技大学材料科学与工程学院,西安710021 [2]教育部轻工助剂化学与技术重点实验室,西安710021

出　　处：《人工晶体学报》2011年第1期44-47,59,共5页Journal of Synthetic Crystals

基　　金：国家自然科学基金(51072106);教育部科学技术研究重点项目(209126);陕西省科技厅工业攻关项目(2010K10-14);陕西科技大学研究生创新基金

摘　　要：采用固相反应法制备了(1-x)BaTiO3-xBi0.5K0.5TiO3(BT-BKT,x=0,0.1和0.2),对陶瓷样品进行X射线衍射、扫描电镜、介电常数-温度及电阻率-温度测试分析,研究了掺杂BKT对该系统陶瓷相组成、显微结构和电性能的影响。结果表明:BaTiO3陶瓷的晶格参数c轴值随着BKT含量的增加基本不变,而a轴值有所减小。BT-BKT陶瓷的居里温度(Tc)随着BKT的加入向高温移动,当x=0.1和0.2时,Tc分别提高至170℃和185℃左右;但室温电阻率随着BKT含量的增加明显增大。（1-x）BaTiO3-xBi0.5K0.5TiO3（BT-BKT,where x=0,0.1 and 0.2） ceramics were prepared by solid state reaction method.The effect of BKT doping on the phase composition,microstructure and electrical property were investigated by XRD,SEM and permittivity-temperature and resisitivity-temperature analysis.The results indicated that the lattice parameters of BT ceramics changed with the BKT content.The value of c-axis is almost the same as that of the pure BT,but a slight decrease is found in the value of the a-axis.Temperature dependence of permittivity and resistivity of sintered ceramic samples indicated that the Curie temperature（Tc） enhanced distinctly than that without BKT addition.With the addition of x=0.1 and 0.2 BKT,the Tc elevated to ~170 ℃ and ~185 ℃,respectively.However,the room temperature resistivity rises sharply with the increasing content of BKT.

关 键 词：固相法 BaTiO3-Bi0.5K0.5TiO3 电阻率 居里温度 

分 类 号：TQ174[化学工程—陶瓷工业]