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Effect of Tm2O3 addition on dielectric property of barium titanate ceramics for MLCCs

  • Journal of the Korean Crystal Growth and Crystal Technology
  • Abbr : J. Korean Cryst. Growth Cryst. Technol.
  • 2010, 20(1), pp.25-29
  • Publisher : The Korea Association Of Crystal Growth, Inc.
  • Research Area : Engineering > Materials Science and Engineering

김진성 1,  Lee, Hee-Soo 1,  강도원 2,  김정욱 2

1부산대학교
2(주)삼성전기 LCR Division

Accredited

ABSTRACT

Thulium oxide-doped barium titanate ceramics for MLCCs with perovskite structure were prepared by a sintering process at 1320oC for 2 h in a reduced atmosphere. The effect of Tm2O3 addition on dielectric property of barium titanate ceramics has been studied in terms of their microstructures. Moreover, the phase identification of the dielectric specimens was conducted to define the secondary phase (pyrochlore). The specimen doped with 1 mol% Tm2O3 exhibited the highest dielectric constant. However, the dielectric constants of specimens with more than 2 mol% Tm2O3 to BaTiO3 were the lower values than that of 1 mol% doped one. The grain size and the formation of pyrochlore phase associated with the dielectric properties were examined through morphology development and the structural analysis. Furthermore, these data were compared with the property of the dielectric material doped with Er2O3. It could be concluded that the dielectric property of ceramic capacitors were attributed to the change of pyrochlore phase and the tetragonality of BaTiO3 with doping.

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