首页 | 本学科首页   官方微博 | 高级检索  
     


Site occupation of doping La3+ cations and phase transition in Na0.5Bi0.5TiO3–BaTiO3 solid solution
Authors:Liu Li-Ying  Wang Ru-Zhi  Zhu Man-Kang  Hou Yu-Dong
Affiliation:a School of Applied Mathematics and Physics, Beijing University of Technology, Beijing 100124, China;b College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China
Abstract:Effects of La doping on the ferroelectric properties of 0.92Na0.5Bi0.5TiO3–0.08BaTiO3 (NBT–BT) solid solution have been studied both experimentally and theoretically. The experimental results show that an abnormal ferro-to-antiferroelectric phase transition is induced by La doping in NBT–BT. The first-principles calculations indicate that La3+ cations selectively substitute for the A site in NBT–BT as donors. Furthermore, the computed binding energy reveals that La cations is most likely to substitute for Ba2+ or Na+ to Bi3+ at A site as donors in NBT–BT, as supported by our Raman spectra. The ferro-to-antiferroelectric phase transition of La-doped NBT–BT is believed to originate from the lattice aberrance and redistribution of valence electrons, thus strengthening the bonding of A–O, enhancing the hybridization between the A cation d orbital and O 2p orbital, and resulting in the deflection of the polar direction of NBT–BT lattice.
Keywords:Na0.5Bi0.5TiO3  first principles  occupation selectivity  phase transition
本文献已被 CNKI 维普 等数据库收录!
点击此处可从《中国物理 B》浏览原始摘要信息
点击此处可从《中国物理 B》下载免费的PDF全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号