应用于压电能量收集器的PZT PZN系陶瓷材料

压电材料作为环境振动能量收集器的核心功能材料,是制备高性能能量收集器的关键。该文从提高能量收集效率入手,研究适合于能量转换的高性能压电陶瓷材料。采用两步合成工艺制备出了0.7Pb(Zr0.51Ti0.49)0.99O3-0.3Pb(Zn1/3Nb2/3)O3(PZT-PZN)压电陶瓷,研究了La2O3掺杂对其微观结构和机电性能的影响。实验结果表明,掺杂少量的La2O3能显著提高PZT-PZN陶瓷的压电系数(d33)、机电耦合系数(k31、kp)、介电常数(εr)等。当掺杂量为4%(摩尔分数)时,在1 200℃烧结PZT-PZN,显示出良好的压电和介电性能:d33=560pC/N,k31=0.376,kp=0.642,s1E1=16.5×10-12 m2/N,εr=3 125。

Piezoelectric Materials PZT PZN for Energy Harvesting Device

The piezoelectric material is the key of preparing the energy harvesting device with high performance as a kind of core functional material for environmental vibration energy harvesting device.The 0.7Pb(Zr0.51Ti0.49)0.99O3-0.3Pb(Zn1/3Nb2/3)O3(PZT-PZN)piezoelectric ceramic were prepared by the two step synthetic method.The effect of different doped mass contents of La2O3 on the crystallographic phase and electromechanical properties have been studied.The results showed that the piezoelectric coefficient d33,the electromechanical coupling factor(k31,kp) and the dielectric constant εr have been improved with little La2O3 dopants.The PZT-PZN ceramic sintered with 4% La2O3 doping possesses the optimum propeties of d33=560 pC/N,k31=0.376,kp=0.642,sE11=16.5×10-12m2/N,εr=3 125.