The incompatibility between large electro-strain and low-strain hysteresis,in addition to the poor tem-perature stability of piezoelectric ceramics,limits the development of high-precision piezoelectric actu-ators.In ...The incompatibility between large electro-strain and low-strain hysteresis,in addition to the poor tem-perature stability of piezoelectric ceramics,limits the development of high-precision piezoelectric actu-ators.In this work,Bi_(0.465)Na_(0.465)Ba_(0.07)Ti_(1−2 x)Ga_(x)Sb_(x)O_(3)(abbreviated as BNBT7-x GS,x=0,0.01,0.02,0.03,0.04,and 0.06)ceramics were designed.Specifically,when x=0.02,the ceramics exhibit a critical state in the relaxor ferroelectric system with a typical relaxor P−E loop and an I−E curve of four peaks.At this composition,the room temperature strain is 0.40%,which is capable of enhancing the electro-strain and reducing the hysteresis simultaneously.Furthermore,over the wide temperature range from 30 to 180℃,the minimum strain hysteresis(H_(ys))is 7.13%,and the maximum strain variation is only 16.8%,demonstrating ultra-high temperature stability.This work introduces a model for addressing the dilemma between good electro-strain properties and insufficient temperature stability in lead-free piezoelectric ceramics,crucial for the development of modern high-precision actuators.展开更多
基金financially supported by the National Natural Science Foundation of China(No.U2006218)the Project of“20 Items of University”of Jinan(No.T202009)the Taishan Scholars Program(No.tstp20221130).
文摘The incompatibility between large electro-strain and low-strain hysteresis,in addition to the poor tem-perature stability of piezoelectric ceramics,limits the development of high-precision piezoelectric actu-ators.In this work,Bi_(0.465)Na_(0.465)Ba_(0.07)Ti_(1−2 x)Ga_(x)Sb_(x)O_(3)(abbreviated as BNBT7-x GS,x=0,0.01,0.02,0.03,0.04,and 0.06)ceramics were designed.Specifically,when x=0.02,the ceramics exhibit a critical state in the relaxor ferroelectric system with a typical relaxor P−E loop and an I−E curve of four peaks.At this composition,the room temperature strain is 0.40%,which is capable of enhancing the electro-strain and reducing the hysteresis simultaneously.Furthermore,over the wide temperature range from 30 to 180℃,the minimum strain hysteresis(H_(ys))is 7.13%,and the maximum strain variation is only 16.8%,demonstrating ultra-high temperature stability.This work introduces a model for addressing the dilemma between good electro-strain properties and insufficient temperature stability in lead-free piezoelectric ceramics,crucial for the development of modern high-precision actuators.
