Li2CO3掺杂对PZN-PNN-PZT陶瓷结构及性能的影响

Influence of Li2CO3 Doping on Structure and Properties of PZN-PNN-PZT Piezoelectric Ceramics

采用固相法制备了0.1Pb(Zn1/3Nb2/3)O3-0.1Pb(Ni1/3Nb2/3)O3-0.8Pb(Zr0.52Ti0.48)O3+x%Li2CO3(PZN-PNN-PZT,x为质量分数)低温压电陶瓷,研究了Li2CO3掺杂对PZN-PNN-PZT压电陶瓷晶体结构、微观形貌及电学性能的影响。实验结果表明,随着Li2CO3含量的增加,PZN-PNN-PZT陶瓷晶体结构从三方相向四方相转变,陶瓷晶粒尺寸先增大后减小。掺杂适量的Li2CO3能有效提高PZN-PNN-PZT陶瓷的电学性能。当x=0.3时,PZN-PNN-PZT陶瓷具有最好的综合性能:压电常数d33=530pC/N,机电耦合系数kp=0.55,品质因数Qm=60,居里温度TC=176℃,相对介电常数εr=2800,剩余极化强度Pr=32.80μC/cm^2,矫顽场Ec=0.96kV/mm。

The low-temperature sintering 0.1Pb(Zn1/3Nb2/3)O3-0.1Pb(Ni1/3Nb2/3)O3-0.8Pb(Zr0.52Ti0.48)O3+x%Li2CO3(PZN-PNN-PZT)piezoelectric ceramics were synthesized by solid-state reaction method.The effects of Li2CO3 doping on the crystal structure,microstructure and electrical properties for the PZN-PNN-PZT piezoelectric ceramics were investigated.The experimental results showed that the phase structure of the PZN-PNN-PZT ceramic transformed from the trigonal phase to the tetragonal phase with the increase of Li2CO3,the grain size firstly increased and then decreased.The electrical properties of PZN-PNN-PZT ceramics can be effectively improved by doping appropriate amount of Li2CO3.When x is 0.3,the PZN-PNN-PZT ceramic exhibited the best comprehensive properties:the piezoelectric constant d33=530 pC/N,electromechanical coupling coefficient kp=0.55,mechanical quality factor Qm=60,Cuire temperature TC=176℃,relative dielectric constant εr=2 800,residual polarization intensity Pr=32.80μC/cm^2,coercivity field Ec=0.96 kV/mm.