Piezoelectric and Dielectric Properties of (Bi0.5Na0.5)0.94(Ba1-xSrx)0.0sTiO3 Lead-free Piezoelectric Ceramics
Lead-free piezoelectric ceramics (Bi0.5Na0.5)0.94(Ba1-xSrx)0.06TiO3 (abbreviated as BNBST-100x,with x ranges from 0.02 to 0.1) have been investigated.Effects of amount of Sr-substitution on the electrical properties and crystal structure of the ceramics were studied.The BNBST-100x ceramics sintered at 1200℃ for 2h in air have high density around 5.69~5.75g/cm3.X-ray diffraction (XRD) analysis shows that all of the BNBST-100x ceramics have pure perovskite structure.At high amount level of Sr-substitution,the crystal structure of the samples changes from rhombohedral to tetragonal symmetry.Piezoelectric and dielectric measurements reveal that Sr-substitution amount within a certain range will lead to the increase of piezoelectric coefficient (d33),electromechanical coupling factor (kp),and relative dielectric constant (ε33T/ε0).At 6 mol% St-substitution level,the d33 and kp of the ceramics reach maximum,with values of 168 pC/N and 34%,respectively.
Lead-free piezoelectric ceramics Piezoelectric properties Sr-substitution
Zhiwu Chen Zhenya Lu Jianqiang Hu
School of Materials Science and Engineering,South China University of Technology,Guangzhou 510640,Ch School of Chemical Science,South China University of Technology,Guangzhou 510640,China
国际会议
The Fifth China International Conference on High-Performance Ceramics (第五届先进陶瓷国际研讨会(CICC-5))
长沙
英文
1911-1914
2007-05-10（万方平台首次上网日期，不代表论文的发表时间）