Analysis on dipole polarization of BaTiO3-based ferroelectric ceramics by Raman spectroscopy
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概要
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Analysis of asymmetric Raman line shape disclosed the variation of phonon correlation length in A1(3TO) mode, LA1(3TO), with temperature in the ceramics of BaTiO3 (BT), Ba0.6Sr0.4TiO3 (BST-0.6) and BaZr0.25Ti0.75O3 (BZT-0.25), namely normal ferroelectrics, ferroelectrics with diffuse phase transition (DPT ferroelectrics) and relaxor ferroelectrics, respectively. In BT, LA1(3TO) exhibited steep increase at the Curie temperature (Tc) on cooling. This is attributed to the formation of the ferroelectric domains at the Tc. Both BST-0.6 and BZT-0.25 showed gradual increase in LA1(3TO) on cooling across the dielectric maximum temperature (Tm), indicating the continuous increase in the average size of the polar nanoregions (PNRs). Normal ferroelectrics can be distinguished from DPT and relaxor ferroelectrics in this point. LA1(3TO) of BZT-0.25 was longer than that of BST-0.6 near the Tm. This suggests the size of PNRs in BZT-0.25 is larger than that in BST-0.6. Huge dipole polarization of BZT-0.25, giving rise to the strong relaxor behavior, could be originated from the contribution of the large PNRs near the Tm. DPT ferroelectrics can be also differentiated from relaxor ferroelectrics in terms of the average size of PNRs.
著者
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TSURUMI Takaaki
Graduate School of Science and Engineering, Tokyo Institute of Technology
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Hoshina Takuya
The Graduate School Of Sci. And Engineering Tokyo Inst. Of Technol.
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HOSHINA Takuya
Graduate School of Science and Engineering, Tokyo Institute of Technology
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Takeda Hiroaki
Graduate School of Science and Technology, Tokyo Institute of Technology
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Teranishi Takashi
Graduate School of Science and Engineering, Tokyo Institute of Technology
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Horiuchi Naohiro
Graduate School of Science and Engineering, Tokyo Institute of Technology
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Hoshina Takuya
Graduate School Of Science And Engineering Tokyo Institute Of Technology
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Hoshina Takuya
Department Of Metallurgy And Ceramics Science Tokyo Institute Of Technology
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Tsurumi Takaaki
Graduate School Of Science And Engineering Tokyo Institute Of Technology
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Takeda Hiroaki
Graduate School Of Materials Science Nara Institute Of Science And Technology (naist)
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Takeda Hiroaki
Graduate School of Material Science, Nara Institute of Science and Technology (NAIST), 8916-5 Takayama-cho, Ikoma, Nara 630-0192, Japan
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Teranishi Takashi
Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan
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Tsurumi Takaaki
Graduate School of Materials Science and Technology, Tokyo Institute of Technology, Meguro, Tokyo 152-8552, Japan
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