开发具有优异综合储能特性的无铅陶瓷电容器是脉冲功率技术领域的迫切需求。相较于其他无铅储能陶瓷体系,Na Nb O_(3)(NN)陶瓷具有结构相变丰富、理论密度低、电学可调性强、轻量化发展潜力大等显著优点,因而备受关注,成为当前的研究热...开发具有优异综合储能特性的无铅陶瓷电容器是脉冲功率技术领域的迫切需求。相较于其他无铅储能陶瓷体系,Na Nb O_(3)(NN)陶瓷具有结构相变丰富、理论密度低、电学可调性强、轻量化发展潜力大等显著优点,因而备受关注,成为当前的研究热点。基于降低容忍因子稳定反铁电相和增强陶瓷弛豫性的策略,开展了NN基弛豫反铁电陶瓷的制备与储能特性研究。通过引入BiFeO_(3)和Sr(Ti_(0.85)Zr_(0.15))O_(3)成功制备了0.9[0.9NaNbO_(3)-0.1BiFeO_(3)]-0.1Sr(Ti_(0.85)Zr_(0.15))O_(3)陶瓷,相较于纯NN陶瓷(0.14 J/cm^(3)、6.39%)和0.9NaNbO_(3)-0.1BiFeO_(3)陶瓷(3.55 J/cm^(3)和70.61%),其储能特性显著提升,储能密度(Wrec)与储能效率(η)分别达到了5.22 J/cm^(3)、83.92%。其优异的储能特性源于BiFeO_(3)和Sr(Ti_(0.85)Zr_(0.15))O_(3)掺杂对陶瓷的晶粒细化、反铁电相稳定性和弛豫特性的双增强机制。同时,0.9[0.9NaNbO_(3)-0.1Bi Fe O_(3)]-0.1Sr(Ti_(0.85)Zr_(0.15))O_(3)陶瓷表现出良好的温度及频率稳定性,是一种极具应用前景的电介质储能材料。展开更多
The structure-property relationships in Ba0.4Sr0.6Ti1-ySiyO3 with y=0.00,0.01,0.02,0.05,0.10 and 0.20 ceramics have been studied by using X-ray diffraction,electron microscopy and dielectric spectroscopy.An increase o...The structure-property relationships in Ba0.4Sr0.6Ti1-ySiyO3 with y=0.00,0.01,0.02,0.05,0.10 and 0.20 ceramics have been studied by using X-ray diffraction,electron microscopy and dielectric spectroscopy.An increase of Si concentration is not favorable for the stability of the perovskite structure,which results in the formation of BaTiSiO5 secondary phase.The dielectric peaks of samples are suppressed,broadened and shifted to low temperature with increasing Si concentration.Permittivity and Q value are reduced gradually with increasing Si concentration,due to growing of second BaTiSiO5 phase.The tunability(T) still remains ～18.0% under 60 kV/cm biasing for the samples with y-0.10.The best combination of microwave dielectric properties are obtained for the composition of y=0.10:-=531,Q=391(at 1.610 GHz) and T=17.7%.展开更多
Inspired by increasing demand of advanced pulsed power capacitors,the development of lead-free dielectric ceramic capacitors with high energy storage density and temperature-insensitive performance are extremely cruci...Inspired by increasing demand of advanced pulsed power capacitors,the development of lead-free dielectric ceramic capacitors with high energy storage density and temperature-insensitive performance are extremely crucial.Herein,the lead-free relaxor ferroelectric ceramics based on(1-x)(Na_(0.5)Bi_(0.5))0.6Sr_(0.4)TiO_(3-x)Sr_(0.7)La_(0.2)ZrO_(3)[abbreviated as(1-x)NBST-xSLZ]are prepared by the solid-state reaction route.The large recoverable energy density(Wrec)of 3.45 J/cm^(3) and efficiency(h)of 90.1%are simultaneously realized in 0.86NBST-0.14SLZ ceramic due to increased breakdown strength.Furthermore,both the Wrec and h of 0.86NBST-0.14SLZ ceramic display superior of thermal stability(20e180C),frequency stability(1e1000 Hz),and cycle stability(10^(4))within a satisfactory range of variation.In addition,the 0.86NBST-0.14SLZ ceramic can also achieve a large current density(CD)of 625 A/cm^(2),an ultrahigh power density(PD)of 50 MW/cm^(3) and a fast discharge rate(t0.90)of 160.8 ns at 160 kV/cm.These results demonstrate that the 0.86NBST-0.14SLZ ceramic could be a highly competitive and ecofriendly relaxor ferroelectric material for next-generation pulsed power capacitors.展开更多
文摘开发具有优异综合储能特性的无铅陶瓷电容器是脉冲功率技术领域的迫切需求。相较于其他无铅储能陶瓷体系,Na Nb O_(3)(NN)陶瓷具有结构相变丰富、理论密度低、电学可调性强、轻量化发展潜力大等显著优点,因而备受关注,成为当前的研究热点。基于降低容忍因子稳定反铁电相和增强陶瓷弛豫性的策略,开展了NN基弛豫反铁电陶瓷的制备与储能特性研究。通过引入BiFeO_(3)和Sr(Ti_(0.85)Zr_(0.15))O_(3)成功制备了0.9[0.9NaNbO_(3)-0.1BiFeO_(3)]-0.1Sr(Ti_(0.85)Zr_(0.15))O_(3)陶瓷,相较于纯NN陶瓷(0.14 J/cm^(3)、6.39%)和0.9NaNbO_(3)-0.1BiFeO_(3)陶瓷(3.55 J/cm^(3)和70.61%),其储能特性显著提升,储能密度(Wrec)与储能效率(η)分别达到了5.22 J/cm^(3)、83.92%。其优异的储能特性源于BiFeO_(3)和Sr(Ti_(0.85)Zr_(0.15))O_(3)掺杂对陶瓷的晶粒细化、反铁电相稳定性和弛豫特性的双增强机制。同时,0.9[0.9NaNbO_(3)-0.1Bi Fe O_(3)]-0.1Sr(Ti_(0.85)Zr_(0.15))O_(3)陶瓷表现出良好的温度及频率稳定性,是一种极具应用前景的电介质储能材料。
基金supported by the National Basic Research Program of China ("973" Project) (Grant No. 2009CB623302)
文摘The structure-property relationships in Ba0.4Sr0.6Ti1-ySiyO3 with y=0.00,0.01,0.02,0.05,0.10 and 0.20 ceramics have been studied by using X-ray diffraction,electron microscopy and dielectric spectroscopy.An increase of Si concentration is not favorable for the stability of the perovskite structure,which results in the formation of BaTiSiO5 secondary phase.The dielectric peaks of samples are suppressed,broadened and shifted to low temperature with increasing Si concentration.Permittivity and Q value are reduced gradually with increasing Si concentration,due to growing of second BaTiSiO5 phase.The tunability(T) still remains ～18.0% under 60 kV/cm biasing for the samples with y-0.10.The best combination of microwave dielectric properties are obtained for the composition of y=0.10:-=531,Q=391(at 1.610 GHz) and T=17.7%.
基金supported by the National Nature Science Foundation of China(Grant No.51902167)Zhejiang Province Nature Science Foundation of China(Grant No.LY21E020002)+1 种基金Ningbo Nature Science Foundation of China(Grant No.2019A610001)Key Laboratory of Engineering Dielectrics and Its Application(Harbin University of Science and Technology),Ministry of Education.
文摘Inspired by increasing demand of advanced pulsed power capacitors,the development of lead-free dielectric ceramic capacitors with high energy storage density and temperature-insensitive performance are extremely crucial.Herein,the lead-free relaxor ferroelectric ceramics based on(1-x)(Na_(0.5)Bi_(0.5))0.6Sr_(0.4)TiO_(3-x)Sr_(0.7)La_(0.2)ZrO_(3)[abbreviated as(1-x)NBST-xSLZ]are prepared by the solid-state reaction route.The large recoverable energy density(Wrec)of 3.45 J/cm^(3) and efficiency(h)of 90.1%are simultaneously realized in 0.86NBST-0.14SLZ ceramic due to increased breakdown strength.Furthermore,both the Wrec and h of 0.86NBST-0.14SLZ ceramic display superior of thermal stability(20e180C),frequency stability(1e1000 Hz),and cycle stability(10^(4))within a satisfactory range of variation.In addition,the 0.86NBST-0.14SLZ ceramic can also achieve a large current density(CD)of 625 A/cm^(2),an ultrahigh power density(PD)of 50 MW/cm^(3) and a fast discharge rate(t0.90)of 160.8 ns at 160 kV/cm.These results demonstrate that the 0.86NBST-0.14SLZ ceramic could be a highly competitive and ecofriendly relaxor ferroelectric material for next-generation pulsed power capacitors.
