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Polarized Micro-Raman Study of the Temperature-Induced Phase Transition In0.67Pb(Mg1/3Nb2/3)O3-0.33PbTiO3 |
| SUN Jing-Ya1,2;YANG Yang2;ZHU Ke2;LIU Yu-Long2;SIU G. G.3;XU Z. K.3 |
| 1College of Science, Beijing University of Chemical Technology, Beijing 1000292Institute of Physics, Chinese Academy of Sciences, Beijing 1000803Department of Physics and Materials Science, City University of Hong Kong, Hong Kong |
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SUN Jing-Ya, YANG Yang, ZHU Ke et al 2008 Chin. Phys. Lett. 25 290-293 |
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Abstract Polarized Raman spectra of ferroelectric relaxor 0.67Pb(Mg1/3Nb2/3)O3-0.33PbTiO3 (0.67PMN-0.33PT) single crystal are systematically investigated in a wide temperature range from -196 to 600°C by micro-Raman scattering technique. The results clearly reveal that there are two structural phase transitions in such composite ferroelectric relaxor: the rhombohedral-tetragonal (R-T) phase transition and the tetragonal-cubic (T-C) phase transition. The former occurs at about TR-T=34°C, corresponding to the vanishing of the soft A1 mode at 106cm-1 recorded in the parallel polarization. The latter appears at about TT-C=144°C, which can be verified with the vanishing of mode at 780cm-1 measured in the crossed polarization.
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| Keywords:
78.30.-j
77.84.Dy
77.80.Bh
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Received: 20 August 2007
Published: 27 December 2007
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