复合离子(NaCe)取代SrBi_4Ti_4O_(15)陶瓷的介电、铁电、压电特性研究  

Dielectric, ferroelectric, and piezoelectric properties of (NaCe)-modified SrBi_4Ti_4O_(15) ceramics

作　　者：郇正利[1] 闫锋[1] 王文林[1] 陆宏婷 王春明[2] HUAN Zhengli;YAN Feng;WANG Wenlin;LU Hongting;WANG Chunming(China Electronics Technology Group Corporation NO. 46 Research Institute, Tianjin 300220, China;State Key Laboratory of Crystal Materials, School of Physics, Shandong University, Jinan 250100, China)

机构地区：[1]中国电子科技集团公司第四十六研究所,天津300220 [2]山东大学物理学院晶体材料国家重点实验室,山东济南250100

出　　处：《电子元件与材料》2019年第3期34-39,共6页Electronic Components And Materials

基　　金：国家自然科学基金资助项目(51872166);山东大学基本科研业务费专项资金资助(2016JC036;2017JC032)

摘　　要：利用普通陶瓷工艺制备了A位复合离子(NaCe)取代的Sr_(1-)_x(NaCe)_x_(/2)Bi_4Ti_4O_(15)(x=0.00～0.20)压电陶瓷,研究了(NaCe)对SrBi_4Ti_4O_(15)(SBT)陶瓷的介电、铁电和压电特性的影响。研究表明,复合离子(NaCe)的取代降低了SBT陶瓷的介电损耗tanδ,降低了SBT陶瓷的矫顽电场E_c,提高了SBT陶瓷的压电系数d_(33)。纯的SBT压电陶瓷的矫顽场E_c=94 kV/cm,复合离子(NaCe)取代的SBT-NaCe(x=0.10)陶瓷的矫顽场E_c=70 kV/cm。随着复合离子(NaCe)含量的增加,SBT的压电性能先增加,然后减小。在x=0.10组分处,SBT-NaCe(x=0.10)陶瓷具有最大的压电系数d_(33)=28 pC/N,约为纯的SBT陶瓷压电系数(d_(33)约15 pC/N)的两倍,其居里温度T_C为510℃。复合离子(NaCe)取代SBT陶瓷压电性能的提高归因于复合离子(NaCe)的取代降低了SBT压电陶瓷的矫顽电场,使得SBT压电陶瓷更容易极化,从而发挥其潜在的压电性能。同时,压电性能的提高还归因于复合离子(NaCe)的取代降低了SBT压电陶瓷的介电损耗和漏电流。材料的退火实验表明:复合离子(NaCe)取代的SrBi_4Ti_4O_(15)压电陶瓷在400℃以下具有较好的压电性能温度稳定性。The Sr1-x(NaCe)x/2Bi4Ti4O15(x=0.00~0.20) piezoelectric ceramics were prepared by conventional ceramic technique. The dielectric, ferroelectric, and piezoelectric properties of A-site ( NaCe)-modified SrBi 4 Ti4O15 ( SBT) ceramics were investigated. The results indicate that the introduction of NaCe reduces the dielectric loss tanδ, decreases the coercive field E c , and enhances the piezoelectric performance. The coercive field E c of pure SBT ceramics is 94 kV / cm, while the E c of ( NaCe)-modified SBT-NaCe ( x = 0. 10 ) ceramics is 70 kV / cm. With the increase of ( NaCe ) contents, the piezoelectric coefficient d 33 firstly increases, and then decreases. The SBT-NaCe( x = 0. 10) ceramics exhibit the highest piezoelectric performance, with a d 33 = 28 pC / N, which is almost twice the value of pure SBT ( d 33~1 5 pC / N), and have a high Curie temperature TC of 510 ℃. The enhancement of piezoelectric performance of ( NaCe)-modified SBT can be attributed to the decreased coercive field, reduced dielectric loss tanδ, and lowered leakage current. The thermal annealing spectroscopy show that the SBT-NaCe ( x = 0. 10 ) ceramics possess stable piezoelectric properties. This work suggests that ( NaCe)-modified SBT ceramics are promising materials for high temperature piezoelectric applications.

关 键 词：钛酸铋锶 无机非金属材料 无铅压电陶瓷 铁电体 介电特性 压电系数 

分 类 号：TM282[一般工业技术—材料科学与工程]