[1] [1] BEDEKAR V,OLIVER J,PRIYA S.Design and fabrication of bimorph transducer for optimal vibration energy harvesting ［J］.IEEE Trans Ultrason Ferr,2010,57(7):1513-1523.

[2] [2] ZHENG Mupeng,HOU Yudong,ZHU Mankang,et al.Research progress of piezoelectric ceramics for energy harvesting ［J］.J Chinese Ceram Soc,2016,44(3):359-366.

[3] [3] YU Xiaole,HOU Yudong,ZHAO Haiyan,et al.The role of secondary phase in enhancing transduction coefficient of piezoelectric energy harvesting composites ［J］.J Mater Chem C,2019,7(12):3479-3485.

[4] [4] LI Fei,LIN Dabin,CHEN Zibin,et al.Ultrahigh piezoelectricity in ferroelectric ceramics by design ［J］.Nat Mater,2018,17(4):349-354.

[5] [5] YU Xiaole,HOU Yudong,ZHAO Haiyan,et al.Refreshing doping concept in perovskite piezoceramics:Composite modulation hidden behind lattice substitution ［J］.J Am Ceram Soc,2020,103(11):6378-6388.

[6] [6] VIEHLAND D,JANG S J,CROSS L E,et al.Deviation from Curie-Weiss behavior in relaxor ferroelectrics ［J］.Phys Rev B,1992,46(13):8003-8006.

[7] [7] DE LA RUBIA M A,ALONSO R E,DE FRUTOS J,et al.Phase transitions in PbTixHf1-xO3 determined by thermal analysis and impedance spectroscopy ［J］.J Therm Anal Calorim,2009,98(3):793-799.