中国物理B ›› 2010, Vol. 19 ›› Issue (3): 37701-037701.doi: 10.1088/1674-1056/19/3/037701

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Ferroelectric and dielectric properties of La/Mn co-doped Bi4Ti3O12 ceramics

吴云翼, 王晓慧, 李龙土   

  1. State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
  • 收稿日期:2008-07-17 修回日期:2009-09-16 出版日期:2010-03-15 发布日期:2010-03-15
  • 基金资助:
    Project supported by the National Science Fund for Distinguished Young Scholars (Grant No.~50625204), National Natural Science Fund for Creative Research Groups (Grant No.~50621201), and by the Ministry of Science and Technology of China through National Basic Research Program of China (Grant No.~ 2009CB623301) and through National High Technology Research and Development Program of China (Grant No.~2006AA03Z428).

Ferroelectric and dielectric properties of La/Mn co-doped Bi4Ti3O12 ceramics

Wu Yun-Yi(吴云翼)†, Wang Xiao-Hui(王晓慧), and Li Long-Tu(李龙土)   

  1. State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
  • Received:2008-07-17 Revised:2009-09-16 Online:2010-03-15 Published:2010-03-15
  • Supported by:
    Project supported by the National Science Fund for Distinguished Young Scholars (Grant No.~50625204), National Natural Science Fund for Creative Research Groups (Grant No.~50621201), and by the Ministry of Science and Technology of China through National Basic Research Program of China (Grant No.~ 2009CB623301) and through National High Technology Research and Development Program of China (Grant No.~2006AA03Z428).

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摘要： La/Mn co-doped Bi4Ti3O12 ceramics, Bi3.25La0.75Ti3-xMnxO12 (x=0.02, 0.04, 0.06, 0.08), were prepared by the solid-state reaction method. The influence of manganese substitution for the titanium part in Bi3.25La0.75Ti3O12 on the sintering behaviour, microstructure, Raman spectra and electrical properties was investigated. The experimental results show that the phase composition of all samples with and without manganese doping, sintered at 1000~°C, consists of a single phase with a bismuth-layered structure belonging to the crystalline phase Bi4Ti3O12. There is no evidence of any impurity phase, but a small change in crystallographic orientation is observed. The Curie temperature of Bi3.25La0.75Ti3-xMnxO12 ceramics is steadily shifted to lower temperature with increasing Mn-doping content. Moreover, the remnant polarisation (Pr) of Bi3.25La0.75Ti3-xMnxO12 samples increases with Mn-doping content, and the Bi3.25La0.75Ti2.92Mn0.08O12 sample exhibits the largest Pr of 16.6~μ C/cm2.

Abstract: La/Mn co-doped Bi4Ti3O12 ceramics, Bi3.25La0.75Ti3-xMnxO12 (x = 0.02, 0.04, 0.06, 0.08), were prepared by the solid-state reaction method. The influence of manganese substitution for the titanium part in Bi3.25La0.75Ti3O12 on the sintering behaviour, microstructure, Raman spectra and electrical properties was investigated. The experimental results show that the phase composition of all samples with and without manganese doping, sintered at 1000 °C, consists of a single phase with a bismuth-layered structure belonging to the crystalline phase Bi4Ti3O12. There is no evidence of any impurity phase, but a small change in crystallographic orientation is observed. The Curie temperature of Bi3.25La0.75Ti3-xMnxO12 ceramics is steadily shifted to lower temperature with increasing Mn-doping content. Moreover, the remnant polarisation (Pr) of Bi3.25La0.75Ti3-xMnxO12 samples increases with Mn-doping content, and the Bi3.25La0.75Ti2.92Mn0.08O12 sample exhibits the largest Pr of 16.6 μC/cm2.

Key words: bismuth titanate, ceramics, doping, ferroelectric

中图分类号: 

  • 77.80.Bh
77.22.Ej (Polarization and depolarization) 81.20.Ev (Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation) 61.72.up (Other materials) 78.30.Hv (Other nonmetallic inorganics)