Change of Macroscopic and Microscopic Symmetry of Barium Titanate Single Crystal around Curie Temperature
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概要
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Using a high-quality barium titanate single crystal grown by a top-seeded solution growth method, its microscopic and macroscopic symmetries were investigated by Raman scattering measurement and polarizing microscopy, respectively. Moreover, their temperature dependences through Curie temperature were also studied. As a result, we found that the microscopic symmetry of P4mm observed at room temperature did not change through Curie temperature. On the other hand, the macroscopic symmetry on the basis of a insitu domain observation was P4mm below 133°C and Pm3m above the Curie temperature. This difference between microscopic and macroscopic symmetries above the Curie temperature suggests that the barium titanate single crystal above the Curie temperature intrinsically exhibits some disorder behavior. On the basis of the results obtained in this study, the phase transition model of barium titanate single crystal with both displacive and order-disorder behaviors was proposed.
- Publication Office, Japanese Journal of Applied Physics, Faculty of Science, University of Tokyoの論文
- 1998-09-30
著者
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Osada Minoru
Material And Structures Lab. Tokyo Inst. Tech.
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Noma Tatsuo
Department Of Applied Chemistry Tokyo University Of Agriculture & Technology
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Suzuki Takeyuki
Department Of Applied Chemistry Graduate School Of Engineering Tokyo University Of Agriculture And T
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Kakihana Masato
Materials & Structures Laboratory Tokyo Institute Of Technology
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Suzuki Takeyuki
Department of Applied Chemistry, Tokyo University of Agriculture & Technology,
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Noma Tatsuo
Department of Applied Chemistry, Tokyo University of Agriculture & Technology,
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Wada Satoshi
Department of Applied Chemistry, Tokyo University of Agriculture & Technology,
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