期刊
ADVANCED FUNCTIONAL MATERIALS
卷 22, 期 5, 页码 937-942出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201101970
关键词
BiFeO3; multiferroic materials; epitaxial thin films; ferroelectrics
类别
资金
- SSLS via NUS [C-380-003-003-001]
- MOE, Singapore Ministry of Education [T11-0702-P06, R-284-000-054-112]
- Institute of Materials Research and Engineering, A-STAR [IMRE/10-1C0109]
A tetragonal BiFeO3 phase with giant c/a of approximately 1.25 has been of great interest recently as it potentially possesses a giant polarization and much enhanced electromechanical response. This super-tetragonal phase is known to be a stable phase only under high compressive strains of above approximately 4.5%, according to first principle calculations. However, in previous work, this super-tetragonal BiFeO3 phase was obtained in films deposited at high growth rate on SrTiO3 substrates with compressive strain of only around 1.5%. By detailed structure analysis using high resolution synchrotron X-ray diffraction, atomic force microscopy, and transmission electron microscopy, the parasitic beta-Bi2O3 phase is identified as the origin inducing the formation of super-tetragonal BiFeO3 phase on SrTiO3 substrates. In addition, ab initio calculations also confirm that this super-tetragonal phase is more stable than monoclinic phase when Bi2O3 is present. Using Bi2O3 as a buffer layer, an alternative route, not involving strain engineering, is proposed to stabilize this promising super-tetragonal BiFeO3 phase at low growth rates.
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