Sm_2O_3掺杂BSTN陶瓷的制备与介电性能  

Study of Structural and Dielectrical Properties of Sm^(3+)-doped BSTN Ceramics

作　　者：李波[1,2] 沈雷军[1,2] 王忠志[1,2] 高乐乐[1,2] 周永勃[1,2] 

机构地区：[1]稀土冶金及功能材料国家工程研究中心,内蒙古包头014030 [2]包头稀土研究院,内蒙古包头014030

出　　处：《稀土》2012年第1期19-23,共5页Chinese Rare Earths

基　　金：内蒙古自然科学基金项目资助(2009MS0803)

摘　　要：采用溶胶凝胶法制备了Sm3+掺杂(Ba,Sr)TiO3/(Ba,Sr)Nb2O6复相陶瓷,XRD衍射表明,样品由钙钛矿相和钨青铜相组成,无其他杂相生成。随着Sm3+掺杂量的增加,样品衍射峰向小角度方向移动,表明掺杂的Sm3+取代了体系中Nb5+及Ti4+。检测了样品的介电-温度性能,结果表明,随着Sm3+掺杂量的增加,样品的介电常数及介电损耗都有所降低,当Sm3+掺杂量达到0.004时,样品介电损耗最低,再增加Sm3+的掺杂量,样品的介电损耗又出现增加的趋势。可以得出,适量Sm3+的掺杂可以有效降低样品的介电损耗。Series of Sm3＋-doped（Ba,Sr） TiO3/（Ba,Sr） Nb2O6 composite ceramics were synthesized by sol-gel method.XRD patterns showed that the samples consisted of perovskite phase and tungsten bronze phase.With the increasing of doping amount of Sm,the sample diffraction peaks move to small-angle direction,which indicates that Sm3＋ has replaced the Nb5＋or Ti4＋ lattice position in system.Dielectric performance test shows that dielectric constant and dielectric loss reduce with increasing of doping amount of Sm3＋.When doping concentration of Sm3＋ reaches 0.004,the dielectric loss is minimal.It can be confirmed that appropriate concentration of Sm3＋ can significantly reduce the dielectric loss of the sample.

关 键 词：溶胶凝胶法 稀土 介电性能 

分 类 号：TM28[一般工业技术—材料科学与工程]