| 학회 | 한국화학공학회 |
| 학술대회 | 2006년 가을 (10/27 ~ 10/28, 고려대학교) |
| 권호 | 12권 2호, p.2372 |
| 발표분야 | 재료 |
| 제목 | Cation disorder and spontaneous polarization study of fatigue-free ferroelectric (Bi,Ce) 4 Ti 3 O 12 by using neutron powder diffraction and Raman spectroscopy |
| 초록 | Recently, Ce-substituted bismuth titanate, (Bi,Ce) 4 Ti 3 O 12 (BCT), was introduced as an promising candidate for FeRAMs application because of large remnant polarization and fatigue-free behavior. In this study, we prepared Bi 4-x Ce x Ti 3 O 12 (x = 0.25, 0.5 and 0.75) thin films by a pulsed laser deposition method to verify composition dependence of polarization. Structural analysis was also carried out to understand relationship between structural changes and spontaneous polarization. Raman spectroscopy was measured to determine substitution site of Ce atoms between two Bi sites as it is sensitive to the coordination of local sites resulting from atomic substitution and the distortion of polyhedron. Based on the Raman spectroscopy results, Rietveld refinement was performed by using a neutron powder diffraction data which is a useful method to determine structural parameters of oxygen atoms in oxide compounds. The final structure analysis results were used for calculation of spontaneous polarization to compare with experimental results. |
| 저자 | 전민구 1 , 김용일 2 , 윤순길 3 , 우성일 1 |
| 소속 | 1 한국과학기술원 생명화학공학과 & 초미세 화학공정 시스템 연구센터, 2 한국표준과학(연), 3 충남대 |
| 키워드 | ferroelectric ; Raman spectroscopy ; neutron diffraction ; spontaneous polarization |
| VOD | VOD 보기 |
| 원문파일 | 초록 보기 |
