Li Concentration Dependence of Dielectric Responses of Quantum Relaxor K1-xLixTaO3
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概要
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Single crystals of K1-xLixTaO3 (KLT) with different Li concentrations are grown by the self-flux method. Li concentrations in the crystals are determined by second-harmonic-generation microscope observations. Complex dielectric constants of KLT are measured in the temperature range from 20 K to room temperature and the frequency range from 5 Hz to 1 MHz. The results are analyzed using the Cole–Cole plot and the Vogel–Fulcher law. For $x>4.4$%, two semicircles of the Cole–Cole plot appear in a specific temperature region. These two relaxation processes can be explained by the different types of dynamics of Li dipole moments. The activation energy $E_{\text{a}}$ and the characteristic frequency $\nu_{0}$ are determined from the fitting of the two models. It is found that $E_{\text{a}}$ does not show strong Li concentration dependence. The origin of the phenomenon is discussed using a polar nanoregion picture.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2007-10-30
著者
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Uesu Yoshiaki
Depart. Phys. Waseda Univ.
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Yokota Hiroko
Department Of Anatomy Faculty Of Medicine Kyoto University
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Uesu Yoshiaki
Department of Physics, Faculty of Science and Engineering, Waseda University, Shinjuku-ku, Tokyo 169-8555, Japan
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Okada Aoi
Department of Physics, Faculty of Science and Engineering, Waseda University, Shinjuku-ku, Tokyo 169-8555, Japan
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Ishida Izumi
Department of Physics, Faculty of Science and Engineering, Waseda University, Shinjuku-ku, Tokyo 169-8555, Japan
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