Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Electrical Properties and Temperature Stability of Dysprosium and Erbium Co-doped Barium Titanate with Perovskite Structure for X7R MLCCs

Dysprosium과 Erbium이 동시 첨가된 X7R MLCC용 페로브스카이트 BaTiO3의 전기적특성과 온도안정성

  • Noh, Tai-Min (School of Materials Science and Engineering, Pusan National University) ;
  • Kim, Jin-Seong (School of Materials Science and Engineering, Pusan National University) ;
  • Ryu, Ji-Seung (National Core Research Center, Pusan National University) ;
  • Lee, Hee-Soo (School of Materials Science and Engineering, Pusan National University)
  • 노태민 (부산대학교 재료공학부) ;
  • 김진성 (부산대학교 재료공학부) ;
  • 류지승 (부산대학교 하이브리드소재솔루션 국가핵심연구센터) ;
  • 이희수 (부산대학교 재료공학부)
  • Received : 2011.06.08
  • Accepted : 2011.07.22
  • Published : 2011.07.31
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Abstract

The effects of $Dy_2O_3$ and $Er_2O_3$ co-doping on electrical properties and temperature stability of barium titanate ($BaTiO_3$) ceramics were investigated in terms of microstructure and structural analysis. The dielectric constant and the insulation resistance (IR) of 0.7 mol% $Dy_2O_3$ and 0.3 mol% $Er_2O_3$ co-doped dielectrics had about 60% and 20% higher than the values of undoped one, respectively, and the temperature coefficient of capacitance (TCC) met the X7R specification. The addition of $Dy_2O_3$ contributed to electrical properties caused by increase of tetragonality; however, preferential diffusion of $Dy^{3+}$ ions toward A site in $BaTiO_3$ grain exhibited an adverse effect on temperature stability by grain growth. On the other hand, The $Er_2O_3$ addition in $BaTiO_3$ could affect the TCC behavior and the IR with suppression of grain growth caused by reinforcement of grain boundary and electrical compensation. Therefore, the enhanced electrical properties and temperature stability through the co-doping could be deduced from the increase of tetragonality and the suppression of grain growth.

Keywords

References

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