Structural properties of Bi1-xLaxFeO3 studied by micro-Raman scattering

doi:10.1088/1674-1056/19/3/037802

中国物理B ›› 2010, Vol. 19 ›› Issue (3): 37802-037802.doi: 10.1088/1674-1056/19/3/037802

Structural properties of Bi_1-xLa_xFeO₃ studied by micro-Raman scattering

刘洁¹, 蒋毅坚¹, 马树元², 杨洋³, 刘玉龙³, 朱恪³, 张丽艳³

(1)College of Laser Engineering, Beijing University of Technology, Beijing 100124, China; (2)College of Physical Science and Technology, Guangxi University, Nanning 530004, China; (3)Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

收稿日期:2009-04-02 修回日期:2009-07-08 出版日期:2010-03-15 发布日期:2010-03-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos.~10674171 and 10874236).

Structural properties of Bi_1-xLa_xFeO₃ 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

Received:2009-04-02 Revised:2009-07-08 Online:2010-03-15 Published:2010-03-15
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos.~10674171 and 10874236).

摘要/Abstract

摘要： This paper reports that La-doped BiFeO₃ (Bi_1-xLa_xFeO₃, 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 Bi_1-xLa_xFeO₃ 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 Bi_1-xLa_xFeO₃, which may provide useful information for understanding the effects of La content on the structural and magnetic properties of Bi_1-xLa_xFeO₃.

Abstract: This paper reports that La-doped BiFeO₃ (Bi_1-xLa_xFeO₃, 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 Bi_1-xLa_xFeO₃ 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 Bi_1-xLa_xFeO₃, which may provide useful information for understanding the effects of La content on the structural and magnetic properties of Bi_1-xLa_xFeO₃.

Key words: Bi_1-xLa_xFeO₃, Raman scattering, phase transition, spin--phonon coupling

中图分类号: (Magnetomechanical effects, magnetostriction)

75.80.+q

77.84.Bw (Elements, oxides, nitrides, borides, carbides, chalcogenides, etc.) 75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)) 78.30.Hv (Other nonmetallic inorganics) 63.20.-e (Phonons in crystal lattices)

杨洋, 刘玉龙, 朱恪, 张丽艳, 马树元, 刘洁, 蒋毅坚. Structural properties of Bi_1-xLa_xFeO₃ studied by micro-Raman scattering[J]. 中国物理B, 2010, 19(3): 37802-037802.

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 Bi_1-xLa_xFeO₃ studied by micro-Raman scattering[J]. Chin. Phys. B, 2010, 19(3): 37802-037802.

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Structural properties of Bi_1-xLa_xFeO₃ studied by micro-Raman scattering

Structural properties of Bi_1-xLa_xFeO₃ studied by micro-Raman scattering

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