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http://dx.doi.org/10.4191/KCERS.2009.46.2.181

The Doping Effects of Intermediate Rare-earth Ions (Dy, Y and Ho) on BaTiO3 Ceramics  

Park, Kum-Jin (LCR Material Development Group, Samsung Electro-Mechanics)
Kim, Chang-Hoon (LCR Material Development Group, Samsung Electro-Mechanics)
Kim, Young-Tae (LCR Material Development Group, Samsung Electro-Mechanics)
Hur, Kang-Heon (LCR Development Team, Samsung Electro-Mechanics)
Publication Information
Journal of the Korean Ceramic Society / v.46, no.2, 2009 , pp. 181-188 More about this Journal
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.
Keywords
Barium Titanate; MLCC; Core-shell; Rare-earth oxide; Incorporation;
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