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高等学校化学研究 ›› 2006, Vol. 22 ›› Issue (4): 515-519.

• Articles • 上一篇    下一篇

Effects of Cerium Doping at Ti Sites and Europium Doping at Ba Sites on Dielectric Properties of BaTiO3 Ceramics

ZHANG Ya-min1, SUN Xiu-yun2, LU Da-yong3   

  1. 1. College of Chemistry, Jilin University, Changchun 130021, P. R. China;
    2. Applied Chemistry, Jilin Institute of Chemical Technology, Jilin 132022, P. R. China;
    3. Venture Business Laboratory, Department of Chemistry and Chemical Engineering, Faculty of Engineering, Yamagata University, Yonezawa 992-8510, Japan
  • 收稿日期:2005-07-14 出版日期:2006-08-24 发布日期:2011-08-06
  • 基金资助:

    Supported by Fukumori International Patent Co., Ltd.(No. 407053).

Effects of Cerium Doping at Ti Sites and Europium Doping at Ba Sites on Dielectric Properties of BaTiO3 Ceramics

ZHANG Ya-min1, SUN Xiu-yun2, LU Da-yong3   

  1. 1. College of Chemistry, Jilin University, Changchun 130021, P. R. China;
    2. Applied Chemistry, Jilin Institute of Chemical Technology, Jilin 132022, P. R. China;
    3. Venture Business Laboratory, Department of Chemistry and Chemical Engineering, Faculty of Engineering, Yamagata University, Yonezawa 992-8510, Japan
  • Received:2005-07-14 Online:2006-08-24 Published:2011-08-06
  • Supported by:

    Supported by Fukumori International Patent Co., Ltd.(No. 407053).

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摘要： Two special rare earth elements cerium and europium were chosen to conduct chemical modification of the BaTiO3 structure. The cold-pressing ceramic processing technique was used to prepare barium titanate ceramics doped with Ce at Ti sites and with Eu at Ba sites on the base of formulas Ba(Ti1-xCex)O3(x=0.05, 0.10)(CBT) and(Ba1-yEuy)Ti1-y/8O3(y=0.05, 0.10)(EBT). Associated with structures and microstructures, the effects of cerium and europium doping on dielectric properties of BaTiO3 ceramics were discussed. The CBT ceramics exhibit a pseudo-cubic perovskite structure, while the EBT ceramics exhibit a tetragonal perovskite structure with the exception of the existence of a small percentage of the Eu2Ti2O7 phase. The Curie peak of BaTiO3 shifts towards room temperature at rates of 3 ℃/mol Ce atoms and 10 ℃/mol Eu atoms(Eu≤5%), respectively. Compared with the CBT ceramics, the EBT ceramics show significant advantages, such as a narrow fine grain size distribution(1 μm), a lower porosity and a higher density(5.85 g/cm3), more stable dielectric-temperature dependence(ε'=1600-1800 at t＜50 ℃) and a lower dissipation factor(＜0.05). The stability of dielectric constant with frequency in BaTiO3 can extend to 107 Hz due to Ce and Eu doping.

关键词: Cerium, Europium, Barium titanate, Cold-pressing technique, Dielectric constant

Abstract: Two special rare earth elements cerium and europium were chosen to conduct chemical modification of the BaTiO3 structure. The cold-pressing ceramic processing technique was used to prepare barium titanate ceramics doped with Ce at Ti sites and with Eu at Ba sites on the base of formulas Ba(Ti1-xCex)O3(x=0.05, 0.10)(CBT) and(Ba1-yEuy)Ti1-y/8O3(y=0.05, 0.10)(EBT). Associated with structures and microstructures, the effects of cerium and europium doping on dielectric properties of BaTiO3 ceramics were discussed. The CBT ceramics exhibit a pseudo-cubic perovskite structure, while the EBT ceramics exhibit a tetragonal perovskite structure with the exception of the existence of a small percentage of the Eu2Ti2O7 phase. The Curie peak of BaTiO3 shifts towards room temperature at rates of 3 ℃/mol Ce atoms and 10 ℃/mol Eu atoms(Eu≤5%), respectively. Compared with the CBT ceramics, the EBT ceramics show significant advantages, such as a narrow fine grain size distribution(1 μm), a lower porosity and a higher density(5.85 g/cm3), more stable dielectric-temperature dependence(ε'=1600-1800 at t＜50 ℃) and a lower dissipation factor(＜0.05). The stability of dielectric constant with frequency in BaTiO3 can extend to 107 Hz due to Ce and Eu doping.

Key words: Cerium, Europium, Barium titanate, Cold-pressing technique, Dielectric constant