Sb改性CaBi_2Nb_2O_9高温压电陶瓷的研究  

Piezoelectric properties of Sb-modified CaBi_2Nb_2O_9 for high temperature applications

作　　者：刘笑[1] 刘心宇[1,2] 马家峰[1,2] 刘勇[1] 

机构地区：[1]桂林电子科技大学材料科学与工程系,广西桂林541004 [2]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《电子元件与材料》2014年第8期22-24,共3页Electronic Components And Materials

摘　　要：采用固相反应法获得改性的xSb-CaBi2Nb2O9（CBNO）（x=0-0．08）铋层状压电陶瓷。测试结果表明，加入Sb5＋降低了烧结温度，提高了致密度和平面机电耦合系数，样品均为单一相，在Sb含量摩尔分数为4％时，晶粒形貌均匀，压电和机电性能达到最高，如3为12．6pC／N，Kp=12．1％，tanδ=0．4％。添加物并没有显著降低CBNO陶瓷的居里温度，在700℃以下表现了良好的温度稳定性。High Cuie temperature piezoelectric ceramics based on Sb-doped CaBi2Nb2O9 （x=0-0.08） were prepared by a conventional solid state reaction method. The test results show that the addition of Sb2O5 not only improves the density and the planar electromechanical coupling factor of the ceramic, but also decreases the sintering temperature. XRD patterns show that all the ceramic samples possess a single-phase of bismuth oxide layer structure. The CBNO＋4% of mole fraction of Sb content ceramic exhibits the optimum electrical properties：d33=12.6 pC/N, Kp=12.1%, tanδ=0.4%. Research of SEM indicates that the morphology of grain is homogeneous. The ceramic added with Sb205 shows good temperature stability below 700 ℃ and Curie temperature decreases insignificantly.

关 键 词：固相反应法 压电陶瓷 改性 烧结 CaBi2Nb2O9 居里温度 

分 类 号：TM282[一般工业技术—材料科学与工程]