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A polarized micro-Raman study of a 0.65PbMg1/3Nb2/3O3–0.35PbTiO3 single crystal |
Zhang Li-Yan(张丽艳), Zhu Ke(朱恪), and Liu Yu-Long(刘玉龙)† |
Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China |
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Abstract Polarized micro-Raman spectra of a 0.65PbMg1/3Nb2/3O3-0.35PbTiO3 (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 C3v5 (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.
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Received: 21 June 2011
Revised: 27 October 2011
Accepted manuscript online:
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PACS:
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78.30.-j
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(Infrared and Raman spectra)
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77.80.B-
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(Phase transitions and Curie point)
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77.80.Jk
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(Relaxor ferroelectrics)
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Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 10674171 and 10874236). |
Cite this article:
Zhang Li-Yan(张丽艳), Zhu Ke(朱恪), and Liu Yu-Long(刘玉龙) A polarized micro-Raman study of a 0.65PbMg1/3Nb2/3O3–0.35PbTiO3 single crystal 2012 Chin. Phys. B 21 017803
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