采用传统固相法制备了(Na0.5Bi0.5)1-xLaxBi2Nb2O9(NBN-x La^3+,x=0.00,0.04,0.08,0.16,0.24,0.32,0.40)陶瓷,分析了稀土离子La^3+掺杂对Na0.5Bi2.5Nb2O9陶瓷的相结构、微观结构和电学性能的影响。XRD和拉曼结果表明La^3+成功进入NBN晶...采用传统固相法制备了(Na0.5Bi0.5)1-xLaxBi2Nb2O9(NBN-x La^3+,x=0.00,0.04,0.08,0.16,0.24,0.32,0.40)陶瓷,分析了稀土离子La^3+掺杂对Na0.5Bi2.5Nb2O9陶瓷的相结构、微观结构和电学性能的影响。XRD和拉曼结果表明La^3+成功进入NBN晶格内部并减弱了结构的正交畸变。La^3+掺杂引起的结构变化和氧空位浓度的降低使得陶瓷样品更易于被极化,压电活性提升。当x=0.24时,陶瓷的电学性能达到最佳:Tc=647℃,εr=328,tanδ=1.09%,d33=22.8 p C/N,Qm=3259。NBN-0.24La^3+陶瓷压电常数d33在高温下表现出良好的温度稳定性,样品在500℃下退火2 h,压电常数d33仍能保持在20.3 p C/N,为初始值的89%。展开更多
基金National Natural Science Foundation of China(51762024,51562014,51862016 and 51602135)Natural Science Foundation of Jiangxi Province(20171BAB216012,20192BAB206008 and 20192BAB212002)Science Foundation of Jiangxi Provincial Education Department of China(GJJ180718 and GJJ180739)。
文摘采用传统固相法制备了(Na0.5Bi0.5)1-xLaxBi2Nb2O9(NBN-x La^3+,x=0.00,0.04,0.08,0.16,0.24,0.32,0.40)陶瓷,分析了稀土离子La^3+掺杂对Na0.5Bi2.5Nb2O9陶瓷的相结构、微观结构和电学性能的影响。XRD和拉曼结果表明La^3+成功进入NBN晶格内部并减弱了结构的正交畸变。La^3+掺杂引起的结构变化和氧空位浓度的降低使得陶瓷样品更易于被极化,压电活性提升。当x=0.24时,陶瓷的电学性能达到最佳:Tc=647℃,εr=328,tanδ=1.09%,d33=22.8 p C/N,Qm=3259。NBN-0.24La^3+陶瓷压电常数d33在高温下表现出良好的温度稳定性,样品在500℃下退火2 h,压电常数d33仍能保持在20.3 p C/N,为初始值的89%。
