(K,Na)NbO_(3)(KNN)-based lead-free piezoceramics have been the spotlight in search for practically viable candidates to replace the hazardous but dominating lead-containing counterparts.In this work,BaTiO_(3)(BT)modif...(K,Na)NbO_(3)(KNN)-based lead-free piezoceramics have been the spotlight in search for practically viable candidates to replace the hazardous but dominating lead-containing counterparts.In this work,BaTiO_(3)(BT)modified KNN ceramics were fabricated by spark plasma sintering(SPS)and the influence of BT content as well as sintering temperature on the phase structure,microstructure,and electrical properties were investigated.It was found that the 0.96(Na_(0.5)K_(0.5))NbO_(3)-0.04BaTiO_(3)(BT4)ceramics sintered at 1000℃have the optimal performance.Additionally,in-depth analysis of the electrical hysteresis revealed that the internal bias field originating from accumulation of space charges at grain boundaries is responsible for the asymmetry in the hysteresis loops.展开更多
基金National Nature Science Foundation of China(Grants No.51572143,51302144,51332002)the Specialized Research Fund for the Doctoral Program of Higher Education(Grant No.20130002120031)the Tsinghua University Initiative Scientific Research Program(Grant No.20131089230).
文摘(K,Na)NbO_(3)(KNN)-based lead-free piezoceramics have been the spotlight in search for practically viable candidates to replace the hazardous but dominating lead-containing counterparts.In this work,BaTiO_(3)(BT)modified KNN ceramics were fabricated by spark plasma sintering(SPS)and the influence of BT content as well as sintering temperature on the phase structure,microstructure,and electrical properties were investigated.It was found that the 0.96(Na_(0.5)K_(0.5))NbO_(3)-0.04BaTiO_(3)(BT4)ceramics sintered at 1000℃have the optimal performance.Additionally,in-depth analysis of the electrical hysteresis revealed that the internal bias field originating from accumulation of space charges at grain boundaries is responsible for the asymmetry in the hysteresis loops.
