摘要
采用传统的陶瓷工艺制备了Sr掺杂Bi0.5(Na0.8K0.2)0.5TiO3无铅压电陶瓷(化学式为[Bi0.5(Na0.8K0.2)0.5]1-xSrxTiO3,x=0-0.1),研究了Sr掺杂对陶瓷样品的微观结构、压电以及介电性能的影响。X射线衍射结果表明:当掺杂量较小时(x=0,0.02),样品为四方相;随着掺杂量的增加(x=0.04-0.1),样品逐渐转变为三方相。压电与介电性能测试结果表明:样品的压电常数d33和机电耦合系数kp开始时都随着x的增加而逐渐增大,并分别在x=0.06和x=0.04时达到最大值,其后随着x的增加都逐渐减小;样品的介电常数εT33/ε0则随x的增加而几乎线性增加。在x=0.06时,样品的d33=178pC/N,kp=31%,εT33/ε0=850。
Lead-free Bi0.5（Na0.5K0.2）0.5TiO3 piezoelectric ceramics doped with Sr （[Bi0.5（Na0.5K0.2）0.5]l-xSrxTiO3, here x with a varied range from 0 to 10 mol%） were prepared by a conventional sintering technique. Effect of amount of Sr dopant on the microstructure, piezoelectric, and dielectric properties of these samples were investigated. X-ray diffraction （XRD） patterns shows that the [Bi0.5（Na0.5K0.2）0.5]1-xSrxTiO3 samples exist as a tetragonal phase at small Sr doping level （x=0 and 0.02）, but the crystal structure will change from tetragonal to rhombohedral symmetry at higher Sr doping level （x=0.04-0.1）. Moreover, piezoelectric properties measurements also reveal that the piezoelectric constant d33 and coupling factor kp all increase with increasing x, and reach the maximum at x=0.06 and 0.04 respectively. Continually increasing x amount, the piezoelectric constant d33 and coupling factor kp decrease again. Dielectric properties measurements reveal that the dielectric constant ε^T33/ε0 linearly increases with the increase of Sr doping level. At x=0.06, the samples possess a piezoelectric constant d33 of 178 pC/N, a coupling factor kp of 31%, and dielectric constant εr33/ε0 of 850.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2007年第A01期456-459,共4页
Rare Metal Materials and Engineering
基金
华南理工大学特种功能材料及其制各新技术教育部重点实验室主任基金(324E4040020)
华南理工大学自然科学青年基金(324E5041330)
关键词
无铅压电陶瓷
压电性能
介电性能
微观结构
lead-free piezoelectric ceramics
piezoelectric properties
dielectric properties
microstructure
