Journal of South China University of Technology (Natural Science Edition) ›› 2005, Vol. 33 ›› Issue (3): 1-4.

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Preparation and Properties of La-doped BaTiO3 Ceramics(Ⅱ)：By a Surface-Coating Technique of Metal-Organic Compound

Zhuang Zhi-qiang  Wang Yue-hui  Liu Bo  Wang Xin   

  1. College of Materials Science and Engineering,South China Univ.of Tech.,Guangzhou 510640,Guangdong,China
  • Received:2004-04-20 Online:2005-03-25 Published:2005-03-25
  • Contact: 庄志强(1945-)，男，教授，博士生导师，主要从事电子材料与元器件方面的研究 E-mail:tszhuang@seut.edu.cn
  • About author:庄志强(1945-)，男，教授，博士生导师，主要从事电子材料与元器件方面的研究
  • Supported by:

    广东省自然科学基金资助项目(020951)

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Abstract:

In order to satisfy the need for thin layer of dielectric ceramics with small-size grains and high dielectric constant in MLCCs applications,the surface-coating technique was utilized to modify hydrothermal-synthesized BaTiO3(BT)with La-organic compound as the precursor,which was coated on the powders uniformly.It is found from experiments that the organic component completely decomposes at 650 ℃ and a single-phase solid solution
(Ba(1-x) La2x/3 )TiO3 forms after sintering.It is also found that,with the increase in La content,the peak of tempera-ture-dependence of dielectric constant of La-doped Si-BT ceramics is compressed and moves to a low-temperature region,that the average Curie temperature tav decreases linearly with La content, and that the grain size and dielec-tric properties of the ceramics are greatly influenced by the increasing rate of sintering temperature.

Key words: lanthanum doping, barium titanate, powder, ceramic, metal-organic compound, precursor, coating