期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 4, 页码 2648-2653出版社
AMER CHEMICAL SOC
DOI: 10.1021/am509016w
关键词
BiFeO3; supertetragonal; giant polarization; epitaxial thin film; ferroelectric
资金
- Agency for Science, Technology and Research (A*Star) [1121202013]
- Institute of Materials Research and Engineering
- A*STAR
- SSLS via NUS Core Support [C-380-003-003-001]
- Institute of High Performance Computing (IHPC) A*STAR
- National University of Singapore
- Ministry of Education of Singapore [R265-000-257-112]
- [IMRE/10-1C0107]
Ferroelectric perovskites with strongly elongated unit cells (c/a > 1.2) are of particular interest for realizing giant polarization induced by significant ionic off-center displacements. Here we show that epitaxial BiFe0.6Ga0.4O3 (BFGO) thin films exhibit a stable super-tetragonal-like structure with twinning domains regardless of film thickness and substrate induced strain, evidenced with high resolution X-ray diffractometry (HR-XRD), transmission electron microscopy (TEM) and piezoresponse force microscopy (PFM). The origin of the structural stability of BFGO is investigated by the first-principles calculation. The ferroelectric properties of BFGO are studied by PFM, first-principles calculation and macroscopic polarization-electric field (P-E) hysteresis measurement. A giant ferroelectric polarization of similar to 150 mu C/cm(2) is revealed by the first-principles calculations and confirmed by experiments. Our studies provide an alternative pathway of employing Ga-substitution other than the extensively studied strain engineering to stabilize the supertetragonal structure in BiFeO3-based epitaxial thin films.
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