Based on the fundamentals of energy storage capacitors,recoverable energy storage density(Wrec)is greatly dependent on breakdown strength(Eb).In this work,the breakdown performance of 0.92Ba_(0.85)Ca_(0.15)Zr_(0.1)Ti_...Based on the fundamentals of energy storage capacitors,recoverable energy storage density(Wrec)is greatly dependent on breakdown strength(Eb).In this work,the breakdown performance of 0.92Ba_(0.85)Ca_(0.15)Zr_(0.1)Ti_(0.9)O_(3)-0.08Bi_(2/3)(M_(1/3)Ta_(2/3))O_(3)(M=Mg and Zn)is significantly improved through the synergistic effect of defect chemistry and energy band engineering.The addition of A-site deficient Bi_(2/3)(M_(1/3)Ta_(2/3))O_(3)triggers a ferroelectric-to-relaxor ferroelectric phase transition,leading to the formation of local polar nano-regions(PNRs).More importantly,the introduction of Bi_(2/3)(M_(1/3)Ta_(2/3))O_(3)into Ba_(0.85)Ca_(0.15)Zr_(0.1)Ti_(0.9)O_(3)effectively increases the band gap of samples and reduces grain growth and leakage current density by inhibiting the formation of oxygen vacancies,thus enhancing Eb.As a result,an ultrahigh Eb of~681.7 kV cm^(-1) for the 0.92Ba_(0.85)Ca_(0.15)Zr_(0.1)Ti_(0.9)O_(3)-0.08Bi_(2/3)(Zn_(1/3)Ta_(2/3))O_(3)ceramic accompanied by a large maximum polarization(~31.6μC cm^(-2))contributes to a high Wrec of~6.93 J cm^(-3) and efficiency of~82%.Furthermore,all these ceramics exhibited excellent thermal/frequency stability and charge-discharge performances.These findings suggest that defect chemistry and energy band engineering is an effective strategy for developing novel lead-free relaxor ferroelectric ceramics.展开更多
基金supported by the National Science Foundation for Yong Scientists China(Grant No.62004081)the Projects of Jilin Provincial Science and Technology Department(Grant No.YDZJ202201ZYTS420)Projects of the Jilin Provincial Education Department(Grant No.JJKH_(2)0230298KJ and JJKH_(2)0230301KJ).
文摘Based on the fundamentals of energy storage capacitors,recoverable energy storage density(Wrec)is greatly dependent on breakdown strength(Eb).In this work,the breakdown performance of 0.92Ba_(0.85)Ca_(0.15)Zr_(0.1)Ti_(0.9)O_(3)-0.08Bi_(2/3)(M_(1/3)Ta_(2/3))O_(3)(M=Mg and Zn)is significantly improved through the synergistic effect of defect chemistry and energy band engineering.The addition of A-site deficient Bi_(2/3)(M_(1/3)Ta_(2/3))O_(3)triggers a ferroelectric-to-relaxor ferroelectric phase transition,leading to the formation of local polar nano-regions(PNRs).More importantly,the introduction of Bi_(2/3)(M_(1/3)Ta_(2/3))O_(3)into Ba_(0.85)Ca_(0.15)Zr_(0.1)Ti_(0.9)O_(3)effectively increases the band gap of samples and reduces grain growth and leakage current density by inhibiting the formation of oxygen vacancies,thus enhancing Eb.As a result,an ultrahigh Eb of~681.7 kV cm^(-1) for the 0.92Ba_(0.85)Ca_(0.15)Zr_(0.1)Ti_(0.9)O_(3)-0.08Bi_(2/3)(Zn_(1/3)Ta_(2/3))O_(3)ceramic accompanied by a large maximum polarization(~31.6μC cm^(-2))contributes to a high Wrec of~6.93 J cm^(-3) and efficiency of~82%.Furthermore,all these ceramics exhibited excellent thermal/frequency stability and charge-discharge performances.These findings suggest that defect chemistry and energy band engineering is an effective strategy for developing novel lead-free relaxor ferroelectric ceramics.
