A library of ceramic compounds based on the lead-free(K_(x)Na_(1-x))1-yLiy(Nb1-zTaz)O_(3)solid solution has been synthesized and characterized using high-throughput experimentation(HTE)method.The phase space previousl...A library of ceramic compounds based on the lead-free(K_(x)Na_(1-x))1-yLiy(Nb1-zTaz)O_(3)solid solution has been synthesized and characterized using high-throughput experimentation(HTE)method.The phase space previously reported by Saito and Takao has been expanded to{{x,0.1,1.0},{y,0,0.1},{z,0,0.2}},and new phase boundaries are observed.The relative density values show that with the appropriate sintering temperature,~92%of the theoretical density can be reached.The relative permittivity values show that with increasing amount of K+and Ta5+,the dielectric constant values increase.The effect of density on the dielectric constant values is however minimal.Resistivity values ranging from 109 to 1013Ω·cm are obtained for the samples.The piezoelectric charge coefficient values for selected compositions show that higher values are obtained close to the phase boundaries rather than away from them.The properties for the ceramic library using the HTE method are generally 15%-20%less than from the conventional method.This method is therefore more suited for screening of sample compositions than for producing samples with high piezoelectric properties.展开更多
The research on lead-free piezoelectric ceramics has been one of the importantfields worldwide for years for the sustainable development of the world.In recent years,the author and his group concentrated their work on...The research on lead-free piezoelectric ceramics has been one of the importantfields worldwide for years for the sustainable development of the world.In recent years,the author and his group concentrated their work on perovskite lead-free piezoelectric ceramics,especially on(Bi_(1/2)Na_(1/2))TiO_(3)(BNT)-and K_(1/2)Na_(1/2)NbO_(3)(KNN)-based ceramics.In this paper,the researches of the composition design on BNT-and KNN-based lead-free piezoelectric ceramics,the effects of doping on the properties of these ceramics,the study of the temperature stability of these ceramics,and the fabrication technique used in the author's group for these ceramics are reviewed,and the further considerations and some prospects to be resolved in coming years from the viewpoint of the device applications of these ceramics are suggested.展开更多
基金The research leading to these results has received financial support from the Deutsche Forschungs Gemeinschaft(DFG)under Grant No.SCHN 372/16:1-2.
文摘A library of ceramic compounds based on the lead-free(K_(x)Na_(1-x))1-yLiy(Nb1-zTaz)O_(3)solid solution has been synthesized and characterized using high-throughput experimentation(HTE)method.The phase space previously reported by Saito and Takao has been expanded to{{x,0.1,1.0},{y,0,0.1},{z,0,0.2}},and new phase boundaries are observed.The relative density values show that with the appropriate sintering temperature,~92%of the theoretical density can be reached.The relative permittivity values show that with increasing amount of K+and Ta5+,the dielectric constant values increase.The effect of density on the dielectric constant values is however minimal.Resistivity values ranging from 109 to 1013Ω·cm are obtained for the samples.The piezoelectric charge coefficient values for selected compositions show that higher values are obtained close to the phase boundaries rather than away from them.The properties for the ceramic library using the HTE method are generally 15%-20%less than from the conventional method.This method is therefore more suited for screening of sample compositions than for producing samples with high piezoelectric properties.
基金This work was supported by National Science Foundation of China(NSFC Nos.59972020,50410179,50572066,50772068,and 50972095)Foundation of Doctor Training Programin University and College in China(Nos.20030610035 and 20080610020).The author thanks Mrs.Wu Wenjuan for her assistance in preparing the manuscript。
文摘The research on lead-free piezoelectric ceramics has been one of the importantfields worldwide for years for the sustainable development of the world.In recent years,the author and his group concentrated their work on perovskite lead-free piezoelectric ceramics,especially on(Bi_(1/2)Na_(1/2))TiO_(3)(BNT)-and K_(1/2)Na_(1/2)NbO_(3)(KNN)-based ceramics.In this paper,the researches of the composition design on BNT-and KNN-based lead-free piezoelectric ceramics,the effects of doping on the properties of these ceramics,the study of the temperature stability of these ceramics,and the fabrication technique used in the author's group for these ceramics are reviewed,and the further considerations and some prospects to be resolved in coming years from the viewpoint of the device applications of these ceramics are suggested.
