A polarized micro-Raman study of a 0.65PbMg1/3Nb2/3O3–0.35PbTiO3 single crystal

doi:10.1088/1674-1056/21/1/017803

Abstract Polarized micro-Raman spectra of a 0.65PbMg_1/3Nb_2/3O₃-0.35PbTiO₃ (0.65PMN-0.35PT) single crystal poled in the [001] direction are obtained in a wide frequency range (50-2000 cm^-1) at different temperatures. The best fit to the Raman spectrum at 77 K is achieved using 17 Lorenzians to convolute into it, and this is proved to be a reasonable fit. According to the group theory and selection rules of overtone and combinational modes, apart from the seven Raman modes that are from first-order Raman scattering, the remaining ones are attributed to being from second-order Raman scattering. A comparison between the experimental results and theoretical predictions shows that they are in satisfactory agreement with each other. Our results indicate that at 77 K the sample belongs to the rhombohedral symmetry with the C_3v⁵ (R3m) space group (Z=1). In our study, on heating, the 0.65PMN-0.35PT single crystal undergoes a rhombohedral to tetragonal to cubic phase transition sequence. The two phase transitions occur at 340 and 440 K, which correspond to the disappearance of the soft mode near 106 cm^-1 recorded in VV polarization and the vanishing of the band around 780 cm^-1 in VH polarization, respectively.

Keywords: 0.65PMN-0.35PT polarized micro-Raman second-order Raman scattering phase transition

Received: 21 June 2011
Revised: 27 October 2011
Accepted manuscript online:

PACS:	78.30.-j	(Infrared and Raman spectra)
	77.80.B-	(Phase transitions and Curie point)
	77.80.Jk	(Relaxor ferroelectrics)

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

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Zhang Li-Yan(张丽艳), Zhu Ke(朱恪), and Liu Yu-Long(刘玉龙) A polarized micro-Raman study of a 0.65PbMg_1/3Nb_2/3O₃–0.35PbTiO₃ single crystal 2012 Chin. Phys. B 21 017803

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A polarized micro-Raman study of a 0.65PbMg1/3Nb2/3O3–0.35PbTiO3 single crystal

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A polarized micro-Raman study of a 0.65PbMg_1/3Nb_2/3O₃–0.35PbTiO₃ single crystal