Investigation of the Size Effect on the Giant Dielectric Constant of CaCu3Ti4O12 Ceramic

陈恺; 李伟; 刘云飞; 包鹏; 吕笑梅; 朱劲松

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Investigation of the Size Effect on the Giant Dielectric Constant of CaCu3Ti4O12 Ceramic

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Cubic perovskite-related ceramic CaCu3Ti4O12 has a very high dielectric constant larger than 10000 in the kilohertz frequency region. It is almost constant in the 100-600 K region. The ceramic compounds were prepared by conventional solid-state reaction at different sintering temperatures 1040 ℃(C04), 1060 ℃(C06), 1080 ℃(C08),and 1100 ℃(C10). Impedance spectroscopy on Ca Cus Ti4O12 ceramics demonstrates that they are electrically heterogeneous and consist of semi-conducting grains with insulating grain boundaries. It is shown that C06 is the most suitable one for device applications. Surface observation and analysis of the grain-boundary-grained structure were carried out by using scanning electron microscopy, which confirms that the samples have clearly different crystal grain sizes and C06 has a larger grain size of about 20 μm. Compared to the dielectric relaxation spectroscopy, the mechanical relaxation spectroscopy on C06 was performed and a mechanical loss peak was found, which was attributed to the thermally activated behaviour being immanent in the grains.

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《中国物理快报：英文版》 |2004年第9期|1815-1818|共4页
作者
陈恺; 李伟; 刘云飞; 包鹏; 吕笑梅; 朱劲松;
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National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093;

National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093;

National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093;

National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093;

National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093;

National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093;

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Investigation of the Size Effect on the Giant Dielectric Constant of CaCu3Ti4O12 Ceramic

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