Bi_2O_3掺杂对PBSZT压电-铁电陶瓷结构和特性的影响

EFFECT OF BISMUTH OXIDE DOPANT ON THE STRUCTURE AND CHARACTERISTICS OF PBSZT PIEZOELECTRIC AND FERROELECTRIC CERAMICS

采用扎膜工艺和固相反应法制备了Bi2O3掺杂的(Pb0.70Ba0.26Sr0.04)(Zr0.52Ti0.48)O3–xBi2O3(Bi–PBSZT,x=0,0.1%(质量分数,下同),0.3%,0.5%,0.8%,1.0%)压电–铁电陶瓷。通过扫描电镜和X射线衍射表征Bi–PBSZT陶瓷的结构和物相组成,并对其弯曲强度(σb)、相对介电常数(εr)和横向压电应变常数(d31)进行了检测和分析。结果表明:适量Bi2O3(x=0～0.3%)掺杂可使Bi–PBSZT陶瓷晶粒细化,致密度提高,σb增大;陶瓷的εr和d31下降。当Bi2O3掺杂量为0.3%时,Bi–PBSZT陶瓷的性能得到优化,σb为175.21MPa,εr为5520,d31为518×10–12m/V。

The （Pb0.70Ba0.26Sr0.04）（Zr0.52 Ti0.48）O3-x Bi2O3 [Bi-PBSZT,x = 0,0.1% （mass fraction,the same below）,0.3%,0.5%,0.8%,1.0%] piezoelectric and ferroelectric ceramics with Bi2O3-dopant were prepared by the roll formation and solid-state reaction process. The microstructure and phase compositions of the ceramics were investigated by scanning electron microscopy and X-ray diffraction. The bending strength （σb）,relative dielectric constant （εr） and transverse piezoelectric coefficient （d31） of the ceramics were measured. The results show that when the amount of Bi2O3 addition is from 0 to 0.3%,the grain size of the Bi-PBSZT ceramics can be reduced,and its relative density increases,and its σb enhances; while its εr and d31 values exhibit a tendency of reduction. The Bi-PBSZT ceramic with 0.3% Bi2O3 addition has the optimized characteristics with σb = 175.21 MPa,εr = 5 520,d31 = 518 × 10-12 m/V.