Effects of Dysprosium and Thulium addition on microstructure and electric properties of co-doped $BaTiO_3$ for MLCCs

Kim, Do-Wan; Kim, Jin-Seong; Noh, Tai-Min; Kang, Do-Won; Kim, Jeong-Wook; Lee, Hee-Soo

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자료유형: 학술대회자료

저자정보: Kim, Do-Wan (School of materials science and engineering, Pusan National University) Kim, Jin-Seong (School of materials science and engineering, Pusan National University) Noh, Tai-Min (School of materials science and engineering, Pusan National University) Kang, Do-Won (LCR Division, Samsung Electro-mechanics Co. Ltd) Kim, Jeong-Wook (LCR Division, Samsung Electro-mechanics Co. Ltd) Lee, Hee-Soo (School of materials science and engineering, Pusan National University)

저널정보: 한국재료학회 한국재료학회 학술발표대회 한국재료학회 2010년도 춘계학술발표대회

발행연도: 2010.1

수록면: 482 - 482 (1page)

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The effect of additives as rare-earth in dielectric materials has been studied to meet the development trend in electronics on the miniaturization with increasing the capacitance of MLCCs (multi-layered ceramic capacitors). It was reported that the addition of rare-earth oxides in dielectrics would contribute to enhance dielectric properties and high temperature stability. Especially, dysprosium and thulium are well known to the representative elements functioned as selective substitution in barium titanate with perovskite structure. The effects of these additives on microstructure and electric properties were studied. The 0.8 mol% Dy doped $BaTiO_3$ and the 1.0 mol% Tm doped $BaTiO_3$ had the highest electric properties as optimized composition, respectively. According to the increase of rare-earth contents, the growth of abnormal grains was suppressed and pyrochlore phase was formed in more than solubility limits. Furthermore, the effect of two rare-earth elements co-doped $BaTiO_3$ on the dielectric properties and insulation resistance was investigated with different concentration. The dielectric specimens with $BaTiO_3-Dy_2O_3-Tm2O_3$ system were prepared by design of experiment for improving the electric properties and sintered at $1320^{\circ}C$ for 2h in a reducing atmosphere. The dielectric properties were evaluated from -55 to $125^{\circ}C$ (at $1KHz{\pm}10%$ and $1.0{\pm}0.2V$) and the insulation resistance was examined at 16V for 2 min. The morphology and crystallinity of the specimens were determined by microstructural and phase analysis.

#Dielectric #$BaTiO_3$ #co-doped #Dysprosium #Thulium

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