Antiferroelectric to relaxor ferroelectric phase transition in PbO modified (Pb0.97La0.02)(Zr0.95Ti0.05) O-3 ceramics with a large energy-density for dielectric energy storage
Antiferroelectric to relaxor ferroelectric phase transition in PbO modified (Pb0.97La0.02)(Zr0.95Ti0.05) O-3 ceramics with a large energy-density for dielectric energy storage
复制标题
用于介电储能的高能量密度PbO改性(Pb0.97La0.02)(Zr0.95Ti0.05) O-3陶瓷中的反铁电到弛豫铁电相变
作者：
Li Bi;Liu Qiu-Xiang;Tang Xin-Gui;Zhang Tian-Fu;Jiang Yan-Ping;Li Wen-Hua;Luo Jie
采用固相反应法成功制备了铅过量（x = 0，3%，5%，7.5%，10%，15%）的（Pb0.97（1+x）La0.02）（Zr0.95Ti0.05）O3（PLZT 2/95/5）陶瓷。X射线衍射分析表明，一个纯的钙钛矿结构，获得所有的组合物。系统研究了过量铅含量对PLZT 2/95/5陶瓷微观结构、介电性能和储能性能的影响。该陶瓷具有四方相结构，并在120和240 °C出现两个介电峰，分别对应于反铁电-铁电和铁电-顺电相变。由磁滞回线计算的可恢复能量存储密度达到约2.12 J cm-3，效率为92.98%，这是由于从反铁电状态到弛豫铁电状态的相变。在此基础上，对不同铅过量含量的PLZT 2/95/5陶瓷进行了研究，这些陶瓷可能是高储能密度电容器的潜在候选材料。
(Pb0.97(1+x)La0.02)(Zr0.95Ti0.05)O3 (PLZT2/95/5) ceramics with excess lead content (x = 0, 3%, 5%, 7.5%, 10% and 15%) were successfully prepared via a solid-state reaction route. X-ray diffraction analysis indicated that a pure perovskite structure was obtained for all compositions. The effects of excess lead content on the microstructure, dielectric properties, and energy-storage performance of PLZT2/95/5 ceramics were systematically investigated. The ceramics exhibited tetragonal phase structures and showed two dielectric peaks at 120 and 240 °C, corresponding to antiferroelectric–ferroelectric and ferroelectric–paraelectric phase transitions. The recoverable energy-storage density calculated from hysteresis loops reached about 2.12 J cm−3 with an efficiency of 92.98%, which was due to the phase transition from the antiferroelectric state to the relaxor ferroelectric state. Based on these results, typical PLZT2/95/5 ceramics with different lead excess content have been studied, which could be potential candidates for applications in high energy storage-density electrical capacitors.