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Title: Origin of a tetragonal BiFeO 3 phase with a giant c/a ratio on SrTiO 3 substrates
Authors: Liu, H.
Yang, P. 
Yao, K.
Ong, K.P.
Wu, P.
Wang, J. 
Keywords: BiFeO 3
epitaxial thin films
multiferroic materials
Issue Date: 7-Mar-2012
Citation: Liu, H., Yang, P., Yao, K., Ong, K.P., Wu, P., Wang, J. (2012-03-07). Origin of a tetragonal BiFeO 3 phase with a giant c/a ratio on SrTiO 3 substrates. Advanced Functional Materials 22 (5) : 937-942. ScholarBank@NUS Repository.
Abstract: A tetragonal BiFeO 3 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 BiFeO 3 phase was obtained in films deposited at high growth rate on SrTiO 3 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 β-Bi 2O 3 phase is identified as the origin inducing the formation of super-tetragonal BiFeO 3 phase on SrTiO 3 substrates. In addition, ab initio calculations also confirm that this super-tetragonal phase is more stable than monoclinic phase when Bi 2O 3 is present. Using Bi 2O 3 as a buffer layer, an alternative route, not involving strain engineering, is proposed to stabilize this promising super-tetragonal BiFeO 3 phase at low growth rates. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Source Title: Advanced Functional Materials
ISSN: 1616301X
DOI: 10.1002/adfm.201101970
Appears in Collections:Staff Publications

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