Journal of South China University of Technology (Natural Science Edition) ›› 2006, Vol. 34 ›› Issue (7): 1-6.

• Materials Science & Technology • Previous Articles     Next Articles

Surface Coating of BaTiO3 Powders and Modification of BaTiO3-Based Electro-Ceramics

Zhuang Zhi-qiang  Su Tao-long  Liu Bo  Pan Yao-dong  Liu Yong  Wang Xin   

  1. College of Materials Science and Engineering,South China Univ. of Tech. ,Guangzhou 510640,Guangdong,China
  • Received:2006-04-06 Online:2006-07-25 Published:2006-07-25
  • Contact: 庄志强(1945一)，男，教授，博士生导师，主要从事信息功能材料与元器件设计和制造的研究． E-mail:tszhuang@scut.edu.cn
  • About author:庄志强(1945一)，男，教授，博士生导师，主要从事信息功能材料与元器件设计和制造的研究．
  • Supported by:

    广东省自然科学基金资助项目(020951)

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Abstract:

For the homogeneous mixing of BaTiO3(BT) powders with dopants and the exact control of the micro-structures,phases and electrical properties of materials,a heterogeneous nucleation method was used to coat dopant Y(OH)3 on the surface of nano—crystallized hydrothermal BT powders. The coating effect of Y(OH)3 on the pow-ders prepared by two methods was revealed according to the capillary wettability improvement of the coated powders in water and to the effect of the rotating speed on the eccentricity in separating the BT powders from the slurry using a centrifuge. And the influence of doping method on the semiconductivity and room—temperature resistance of the Y-doped BT ceramics was investigated. The properties of the BT-based PTCR ceramics and the dielectric ceramics with fine grain prepared by heterogeneous nucleation method were discussed also. It is demonstrated from the expe-rimental results of capillary wettability that Y(OH)3 can be nicely coated on BT powders via the surface coating.

Key words: barium titanate, powder, surface coating, electro-ceramic, heterogeneous nucleation, capillary wetta-bility, semiconductor, dielectric