Thermal Depolarization Measurement for Na0.5K0.5NbO3 Piezoceramics
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概要
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The thermal depolarization of Na0.5K0.5NbO3 ceramics was investigated by thermally stimulated depolarization current (TSDC) measurement in a short circuit and under a 0.5 V induced bias. The large current anomaly of the relaxation of oxygen vacancies was observed at approximately 370 °C, as well as sharp pyrocurrent peaks at $T_{\text{O--T}}$ (209 °C) and $T_{\text{C}}$ (417 °C) in a short circuit when the ceramics were poled under 3 kV/cm at 150 °C. The temperature of the start of broad current flow (325 °C) was close to the bending point temperature of the Arrhenius plot of the bias-induced TSDC pattern (313 °C). The temperature corresponded to the temperature at which $k_{\text{p}}$ began to decrease. The degradation of the piezoelectric property of the poled Na0.5K0.5NbO3 ceramics closely correlated to the thermal relaxation of oxygen vacancies.
- 2010-09-25
著者
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Kagomiya Isao
Department Of Applied Physics School Of Science And Engineering Waseda University:(present Address)m
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Kakimoto Ken-ichi
Department Of Material Science And Engineering Faculty Of Engineering Nagoya Institute Of Technology
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Kakimoto Ken-ichi
Department of Materials Science and Engineering, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
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Matsudo Hitoshi
Department of Materials Science and Engineering, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
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