Bi掺杂BaTiO_3基PTC陶瓷的制备、微结构和电性能  

Preparation,microstructure and electrical properties of Bi-doped BaTiO_3-based PTC ceramics

作　　者：潘彬[1] 丁士文[1] 邓睿君[1] 王令[1] 张红媛[1] 

机构地区：[1]河北大学化学与环境科学学院,河北保定071002

出　　处：《电子元件与材料》2012年第2期11-14,共4页Electronic Components And Materials

基　　金：河北省自然科学基金资助项目(No.B2005000097)

摘　　要：采用液相掺杂及低温固相反应法制备了Bi掺杂BaTiO3纳米晶体,然后经烧结制得了Bi掺杂BaTiO3基PTC陶瓷。分析了所制Bi掺杂BaTiO3晶体的物相、晶粒大小及微结构,研究了烧结条件对所制PTC陶瓷电性能的影响。结果表明:Bi掺杂BaTiO3晶体在常温下为立方晶系,颗粒基本呈球形且大小均匀,粒径约为60 nm;在烧结温度为1 330℃、保温时间为20 min条件下所制PTC陶瓷性能最佳:室温电阻为26.29,升阻比为3.585×104。Bi-doped BaTiO3 nanocrystal powders were prepared by liquid doping and low-temperature solid-state reaction. Bi-doped BaTiO3-based PTC ceramics were then prepared through sintering the prepared powders. The crystal phase, particle size and microstructure of the prepared powders were investigated, and the effects of sintering condition on the electrical properties of the prepared PTC ceramics were also studied. The results show that the prepared Bi-doped BaTiO3 powders possess a cubic crystal structure at room temperature and have a sphere-like shape and are about 60 nm in size. The PTC ceramics prepared by sintering at 1 330℃ for 20 min shows the best performance （R25 = 26.29 Ω and Rmax/Rmin = 3.585 × 104） in comparison to the ceramics prepared under other conditions.

关 键 词：BATIO3 Bi掺杂 电性能 低温固相反应 PTC陶瓷 

分 类 号：TM283[一般工业技术—材料科学与工程]