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J. Korean Ceram. Soc. > Volume 46(2); 2009 > Article
Journal of the Korean Ceramic Society 2009;46(2): 181.
doi: https://doi.org/10.4191/kcers.2009.46.2.181
BaTiO3 세라믹 내 희토류(Dy, Y, Ho) 첨가 효과
박금진, 김창훈, 김영태, 허강헌1
삼성전기 LCR 재료개발 그룹
1삼성전기 LCR 개발팀
The Doping Effects of Intermediate Rare-earth Ions (Dy, Y and Ho) on BaTiO3 Ceramics
Kum-Jin Park, Chang-Hoon Kim, Young-Tae Kim, Kang-Heon Hur1
LCR Material Development Group, Samsung Electro-Mechanics
1LCR Development Team, Samsung Electro-Mechanics
ABSTRACT
The electrical property and microstructure in $BaTiO_3$ ceramics doped rare-earth ions with intermediate ionic size ($Dy^{3+},Ho^{3+},Y^{3+}$) were investigated. Microstructures have been characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). Incorporation of rare-earth ions to $BaTiO_3$ ceramics depended on their ionic radius sensitively. Compared to Ho and Y ions, Dy ions provide $BaTiO_3$ ceramics with the high rate of densification and well-developed shell formation, due to their high solubility in the $BaTiO_3$ lattice, but the microstructure of Dy doped $BaTiO_3$ ceramics is unstable at high temperature, because Dy ions could not play a role of grain growth inhibition, leading to diffuse into $BaTiO_3$ lattice continuously after completion of densification during sintering. Comparing electrical property and microstructure, it is shown that the reliability of capacitor improved by high shell ratio.
Key words: Barium Titanate, MLCC, Core-shell, Rare-earth oxide, Incorporation
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