A composite approach boosts transduction coefficients of piezoceramics for energy harvesting

Xiaole Yu,Haiyan Zhao,Yudong Hou,Mupeng Zheng,Mankang Zhu

doi:10.1063/1.5009628

Abstract

Piezoelectric energy harvesting is a hotspot in the field of new energy, the core goal of which is to prepare piezoceramics with a high transduction coefficient (d33×g33). The traditional solid–solution design strategy usually causes the same variation trend of d33 and εr, resulting in a low d33×g33 value. In this work, a composite design strategy was proposed that uses PZN–PZT/ZnAl2O4 as an example. By introducing ZnAl2O4, which is nonferroelectric with low εr, to the PZN–PZT piezoelectric matrix, εr decreased rapidly while d33 remained relatively stable. This behavior was ascribed to the increase of Q33 caused by an interfacial effect facilitating the formation of micro-domain structure.

Highlights

Most researchers have focused on the vicinity of the morphotropic phase boundary (MPB) to obtain materials with high transduction coefficients (d33×g33); this method is called the “solid–solution design strategy” and is based on doping or complexation of multicomponent solid solutions.[5,6,7,8]
Zhang et al found that the introduction of ZnO can increase the depolarization temperature of NBT-based piezoceramics.[9,10,11]
Zhou et al demonstrated that adding Al2O3 to Na0.5Bi2.5Nb2O9 increased its resistivity by over two orders of magnitude, which in turn resulted in the improvement of its high-temperature piezoelectric properties.[13]

Summary

Introduction

Piezoelectric ceramics have attracted considerable technological interest because of their applications in energy harvesting for devices with ultralow power consumption and selfpowered wireless components.[1,2,3,4] Most researchers have focused on the vicinity of the morphotropic phase boundary (MPB) to obtain materials with high transduction coefficients (d33×g33); this method is called the “solid–solution design strategy” and is based on doping or complexation of multicomponent solid solutions.[5,6,7,8] for a solid solution near the MPB, both piezoelectric strain constant (d33) and its dielectric constant (εr) normally present the similar variation trends, both increasing or decreasing with changing composition. A composite approach boosts transduction coefficients of piezoceramics for energy harvesting

Results

Conclusion