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

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

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.

Keywords: Bi_1-xLa_xFeO₃ Raman scattering phase transition spin--phonon coupling

Received: 02 April 2009
Revised: 08 July 2009
Accepted manuscript online:

PACS:	75.80.+q	(Magnetomechanical effects, magnetostriction)
	64.70.K-
	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)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos.~10674171 and 10874236).

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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 2010 Chin. Phys. B 19 037802

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

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