Polarized Raman study on the lattice structure of BiFeO3 films prepared by pulsed laser deposition |
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| Affiliation: | 1. Imaging and Characterization Core Laboratory, King Abdullah University of Science and Technology (KAUST), 47000, Saudi Arabia;2. Advanced Nanofabrication Core Laboratory, King Abdullah University of Science and Technology (KAUST), 47000, Saudi Arabia;3. Division of Physical Science and Engineering, King Abdullah University of Science and Technology (KAUST), 47000, Saudi Arabia;1. Mechanical and Aerospace Engineering, University of California at San Diego (UCSD), La Jolla, CA 92093-0411, United States;2. Department of Environmental Engineering, Chosun University, Gwangju 501-759, Republic of Korea;1. Institute of Analytical Chemistry of the Czech Academy of Sciences, Veveří 97, CZ-60200 Brno, Czech Republic;2. Institute of Food Science and Biotechnology, Faculty of Chemistry, Brno University of Technology, Purkyňova 118, CZ-61200, Brno, Czech Republic;1. College of Materials, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou 311121, China;2. College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, China;1. Department of Electrical Engineering, Chonnam National University, Gwangju 500-757, Republic of Korea;2. Mechanical and Aerospace Engineering, University of California at San Diego, La Jolla,CA 92093, United States;3. Components and Materials Physics Research Center, Korea-Electronics Technology Institute, Seongnam 463-816, Republic of Korea;4. Department of Environmental Engineering, Chosun University, Gwangju 501-759, Republic of Korea;1. Key Laboratory of Marine Chemistry Theory and Technology of Ministry of Education, College of Chemistry & Chemical Engineering, Ocean University of China, Qingdao, Shandong, 266100, China;2. School of Chemical, Biological, and Materials Engineering, University of Oklahoma, Norman, OK, 73019, USA |
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| Abstract: | Polarized Raman spectroscopy was used to study the lattice structure of BiFeO3 films on different substrates prepared by pulsed laser deposition. Interestingly, the Raman spectra of BiFeO3 films exhibit distinct polarization dependences. The symmetries of the fundamental Raman modes in 50–700 cm−1 were identified based on group theory. The symmetries of the high order Raman modes in 900–1500 cm−1 of BiFeO3 are determined for the first time, which can provide strong clarifications to the symmetry of the fundamental peaks in 400–700 cm−1 in return. Moreover, the lattice structures of BiFeO3 films are identified consequently on the basis of Raman spectroscopy. BiFeO3 films on SrRuO3 coated SrTiO3 (0 0 1) substrate, CaRuO3 coated SrTiO3 (0 0 1) substrate and tin-doped indium oxide substrate are found to be in the rhombohedral structure, while BiFeO3 film on SrRuO3 coated Nb: SrTiO3 (0 0 1) substrate is in the monoclinic structure. Our results suggest that polarized Raman spectroscopy would be a feasible tool to study the lattice structure of BiFeO3 films. |
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| Keywords: | Polarized Raman spectroscopy Pulsed laser deposition Substrates |
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