中国物理B ›› 2007, Vol. 16 ›› Issue (10): 3125-3128.doi: 10.1088/1009-1963/16/10/051

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Ferroelectric behaviour of 30nm BaTiO3 ceramics prepared by high pressure assisted sintering

肖长江1, 迟振华1, 李凤英1, 冯少敏1, 靳常青1, 王晓慧2, 邓湘云2, 李龙土2   

  1. (1)Institute of Physics, Chinese Academy of Science, Beijing 100080, China; (2)State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
  • 收稿日期:2006-08-13 修回日期:2006-12-31 出版日期:2007-10-08 发布日期:2007-10-08
  • 基金资助:
    Project supported by the Ministry of Sciences and Technology of China through 973 project (Grant No 2002B613301).

Ferroelectric behaviour of 30nm BaTiO3 ceramics prepared by high pressure assisted sintering

Xiao Chang-Jiang(肖长江)a), Chi Zhen-Hua(迟振华)a), Li Feng-Ying(李凤英)a), Feng Shao-Min(冯少敏)a), Jin Chang-Qing(靳常青)a)† , Wang Xiao-Hui(王晓慧)b), Deng Xiang-Yun(邓湘云)b), and Li Long-Tu(李龙土)b)   

  1. a Institute of Physics, Chinese Academy of Science, Beijing 100080, China; b State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
  • Received:2006-08-13 Revised:2006-12-31 Online:2007-10-08 Published:2007-10-08
  • Supported by:
    Project supported by the Ministry of Sciences and Technology of China through 973 project (Grant No 2002B613301).

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摘要： Dense nanocrystalline BaTiO3 ceramics with a homogeneous grain size of 30\,nm was obtained by pressure assisted sintering. The ferroelectric behaviour of the ceramics was characterized by the dielectric peak at around 120\,\du, the $P$-$E$ hysteresis loop and some ferroelectric domains. These experimental results indicate that the critical grain size for the disappearance of ferroelectricity in nanocrystalline BaTiO3 ceramics fabricated by pressure assisted sintering is below 30\,nm. The ferroelectric property decreasing with decreasing grain size can be explained by the lowered tetragonality and the `dilution' effect of grain boundaries.

关键词: BaTiO3, pressure assisted sintering, nanocrystalline ceramics, ferroelectric behaviour

Abstract: Dense nanocrystalline BaTiO3 ceramics with a homogeneous grain size of 30 nm was obtained by pressure assisted sintering. The ferroelectric behaviour of the ceramics was characterized by the dielectric peak at around 120℃, the $P$-$E$ hysteresis loop and some ferroelectric domains. These experimental results indicate that the critical grain size for the disappearance of ferroelectricity in nanocrystalline BaTiO3 ceramics fabricated by pressure assisted sintering is below 30 nm. The ferroelectric property decreasing with decreasing grain size can be explained by the lowered tetragonality and the `dilution' effect of grain boundaries.

Key words: BaTiO3, pressure assisted sintering, nanocrystalline ceramics, ferroelectric behaviour

中图分类号:  (Domain structure; hysteresis)

  • 77.80.Dj
61.46.-w (Structure of nanoscale materials) 62.50.-p (High-pressure effects in solids and liquids) 81.20.Ev (Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation)