| 학회 | 한국재료학회 |
| 학술대회 | 2010년 봄 (05/13 ~ 05/14, 삼척 팰리스 호텔) |
| 권호 | 16권 1호 |
| 발표분야 | E. Frontiers of Materials Research(선도 재료연구) |
| 제목 | Effects of Dysprosium and Thulium addition on microstructure and electric properties of co-doped BaTiO3 for MLCCs |
| 초록 | 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 BaTiO3 and the 1.0 mol% Tm doped BaTiO3 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 BaTiO3 on the dielectric properties and insulation resistance was investigated with different concentration. The dielectric specimens with BaTiO3-Dy2O3-Tm2O3 system were prepared by design of experiment for improving the electric properties and sintered at 1320℃ for 2h in a reducing atmosphere. The dielectric properties were evaluated from -55 to 125℃ (at 1KHz±10% and 1.0±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. |
| 저자 | Dowan Kim1, Jinseong Kim2, Taimin Noh1, Dowon Kang2, Jeongwook Kim1, Heesoo Lee2 |
| 소속 | 1School of materials science and engineering, 2Pusan National Univ. |
| 키워드 | Dielectric; BaTiO3; co-doped; Dysprosium; Thulium |
