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
Digital light processing(DLP)printing of PbZrTiO_(3)(PZT)ceramics is significantly hampered by the inherent high light absorption of the powder,leading to detrimental defects such as shrinkage and cracking,which sever...Digital light processing(DLP)printing of PbZrTiO_(3)(PZT)ceramics is significantly hampered by the inherent high light absorption of the powder,leading to detrimental defects such as shrinkage and cracking,which severely compromise the final sensor performance.Herein,we propose a strategy to modulate the light absorption of PZT powder by mixing compositions calcined at different tempera-tures.By optimizing the mass ratio of P860 to P1150 to 1:9,we achieved a suspension with enhanced curing depth and rheological properties,enabling the fabrication of high-density ceramics with a piezoelectric constant of 470 pC/N.Furthermore,a sophisticated sandwiched piezoelectric sensor,architected with crossed square columns,demonstrated exceptional electromechanical performance,generating an open-circuit voltage of 278 V and a short-circuit current of 2.19μA.This design conferred a piezoelectric sensitivity approximately 7 times greater than bulk counterparts.Remarkably,despite its compact size of merely 1.3 cm×1.3 cm,this sensor still achieves a transmission power of 5.2 mW during underwater remote energy transfer over a distance of 400 mm.This work establishes a viable pathway for fabricating next-generation high-performance PZT piezoelectric sensors via advanced DLP processing.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.
基金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Digital light processing(DLP)printing of PbZrTiO_(3)(PZT)ceramics is significantly hampered by the inherent high light absorption of the powder,leading to detrimental defects such as shrinkage and cracking,which severely compromise the final sensor performance.Herein,we propose a strategy to modulate the light absorption of PZT powder by mixing compositions calcined at different tempera-tures.By optimizing the mass ratio of P860 to P1150 to 1:9,we achieved a suspension with enhanced curing depth and rheological properties,enabling the fabrication of high-density ceramics with a piezoelectric constant of 470 pC/N.Furthermore,a sophisticated sandwiched piezoelectric sensor,architected with crossed square columns,demonstrated exceptional electromechanical performance,generating an open-circuit voltage of 278 V and a short-circuit current of 2.19μA.This design conferred a piezoelectric sensitivity approximately 7 times greater than bulk counterparts.Remarkably,despite its compact size of merely 1.3 cm×1.3 cm,this sensor still achieves a transmission power of 5.2 mW during underwater remote energy transfer over a distance of 400 mm.This work establishes a viable pathway for fabricating next-generation high-performance PZT piezoelectric sensors via advanced DLP processing.
