采用铌铁矿前驱体两步法制备了Pb(Zn1/3Nb2/3)0.2(Hf1-xTix)0.8O3(PZNH1-xTx)钙钛矿压电陶瓷, 研究了铪钛比对陶瓷相结构、电学性能和能量收集特性的影响。结果表明, 当x=0.52时, 陶瓷样品位于准同型相界, 具有最优综合压电性能: 居里温度TC=287 ℃, 品质因数FOM≈14 753×10-15 m2/N, 压电电荷常数d33=492 pC/N。由该组成材料构建的悬臂梁型压电能量收集器输出功率密度高达4.16 μW/mm3, 所转化的电能可成功点亮138盏并联的LED灯。结果表明, PZNHT陶瓷在压电能量收集领域具有良好的应用潜力。

The Pb(Zn1/3Nb2/3)0.2(Hf1-xTix)0.8O3 (PZNH1-xTx) perovskite piezoceramics were prepared by a two-step columbite precursor method. The effects of the ratio of Hf and Ti on the phase structure, electrical performance and energy harvesting characteristics were investigated. The results show that x=0.52 is located at the morphotropic phase boundary, and has the optimal comprehensive piezoelectric properties: Curie temperature TC of 287 ℃, figure of merit FOM of 14 753×10-15 m2/N, piezoelectric charge constant d33 of 492 pC/N. In addition, the cantilever beam-type piezoelectric energy harvester constructed from x=0.52 sample exhibited an output power density of up to 4.16 μW/mm3 and the generated power can successfully lit 138 parallel LED lights. The above results show that PZNHT ceramics have good application potential in the field of piezoelectric energy harvesting.