Splitting of Triggered Phase Transition in Bi4-xLaxTi3O12 Mixed Crystals
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概要
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Phase transitions in Bi4-xLaxTi3O12 (BLT-$x$) mixed crystals with a low La concentration ($x<0.66$) were investigated by measuring the dielectric constant and hysteresis loop, and carrying out differential thermal analysis (DTA) and domain wall observations. It was found in BLT-$x$ that the triggered transition, i.e., the tetragonal–monoclinic transition observed in Bi4Ti3O12 (BiT, BLT-0), splits into two transitions, i.e., the tetragonal–orthorhombic and orthorhombic–monoclinic transitions, with the addition of La ions. The temperature of the tetragonal–orthorhombic transition remains unchanged at about 673 °C, whereas that of the orthorhombic–monoclinic transition strongly depends upon the La concentration in the range of $0\leq x\leq 0.66$. The phase transitions and their symmetry changes were discussed on the basis of the Landau theory.
- 2007-09-15
著者
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Aoyagi Rintaro
Department Of Engineering Physics Electronics And Mechanics Graduate School Of Engineering Nagoya In
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Iwata Makoto
Department Of Applied Physics School Of Engineering Nagoya University
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Maeda Masaki
Department Of Applied Physics Faculty Of Engineering Nagoya University
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Ishibashi Yoshihiro
Department Of Applied Physics Graduate School Of Engineering Nagoya University
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Zhao Cheng-Hua
Department of Engineering Physics, Electronics and Mechanics, Graduate School of Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan
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