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Structural properties of Bi1-xLaxFeO3 studied by micro-Raman scattering |
Yang Yang(杨洋)a), Liu Yu-Long(刘玉龙) a)†, Zhu Ke(朱恪)a), Zhang Li-Yan(张丽艳)a), Ma Shu-Yuan(马树元)b), Liu Jie(刘洁)c), and Jiang Yi-Jian(将毅坚)c) |
a Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; b College of Physical Science and Technology, Guangxi University, Nanning 530004, China; c College of Laser Engineering, Beijing University of Technology, Beijing 100124, China |
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Abstract This paper reports that La-doped BiFeO3 (Bi1-xLaxFeO3, x=0, 0.1, 0.2, 0.3, 0.6, 0.8 and 1.0) were studied by using micro-Raman spectroscopy and x-ray diffraction (XRD). The XRD patterns indicate that the structure of Bi1-xLaxFeO3 changes from rhombohedral BiFeO3 to orthorhombic LaFeO3. The results of Raman spectroscopy show good agreement with the XRD results. Strikingly, the phonon peak at around 610 cm-1 and the two-phonon peaks in the high frequency range exist in all compounds and enhance with increasing La substitution. The increasing intensity of the 610 cm-1 peak is attributed to the changes in the FeO6 octahedron during the rhombohedral--orthorhombic phase transition. The enhancements of the two-phonon peaks are associated with the breakdown of the cycloid spin configuration with the appearance of the orthorhombic structure. These results indicate the existence of strong spin--phonon coupling in Bi1-xLaxFeO3, which may provide useful information for understanding the effects of La content on the structural and magnetic properties of Bi1-xLaxFeO3.
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Received: 02 April 2009
Revised: 08 July 2009
Accepted manuscript online:
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PACS:
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75.80.+q
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(Magnetomechanical effects, magnetostriction)
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64.70.K-
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77.84.Bw
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(Elements, oxides, nitrides, borides, carbides, chalcogenides, etc.)
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75.30.Kz
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(Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))
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78.30.Hv
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(Other nonmetallic inorganics)
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63.20.-e
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(Phonons in crystal lattices)
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Fund: Project supported by the National
Natural Science Foundation of China (Grant Nos.~10674171 and
10874236). |
Cite this article:
Yang Yang(杨洋), Liu Yu-Long(刘玉龙), Zhu Ke(朱恪), Zhang Li-Yan(张丽艳), Ma Shu-Yuan(马树元), Liu Jie(刘洁), and Jiang Yi-Jian(将毅坚) Structural properties of Bi1-xLaxFeO3 studied by micro-Raman scattering 2010 Chin. Phys. B 19 037802
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