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Polarized Micro-Raman Study of the Temperature-Induced Phase Transition In 0.67 Pb(Mg 1/3 Nb 2/3 )O 3 -0.33PbTiO 3
- Source :
- Chinese Physics Letters. 25:290-393
- Publication Year :
- 2008
- Publisher :
- IOP Publishing, 2008.
-
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 106 cm−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 780 cm−1 measured in the crossed polarization.
Details
- ISSN :
- 17413540 and 0256307X
- Volume :
- 25
- Database :
- OpenAIRE
- Journal :
- Chinese Physics Letters
- Accession number :
- edsair.doi...........134d1a8fc9f5c5d6b7c4ebae64346939