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Investigation of the Size Effect on the Giant Dielectric Constant of CaCu_3Ti_4O_(12) Ceramic

机译：CaCu_3Ti_4O_（12）陶瓷的巨介电常数的尺寸效应研究

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Cubic perovskite-related ceramic CaCu_3Ti_4O_(12) 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 degrees C(C04), 1060 degrees C(C06), 1080 degrees C(C08), and 1100 degrees C(C10). Impedance spectroscopy on CaCusTi4O12 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.
机译：与立方钙钛矿有关的陶瓷CaCu_3Ti_4O_（12）在千赫兹频率范围内具有很高的介电常数，大于10000。在100-600 K的区域内几乎恒定。通过常规的固态反应在不同的烧结温度1040摄氏度（CO4），1060摄氏度（CO6），1080摄氏度（CO8）和1100摄氏度（C10）下制备陶瓷化合物。 CaCusTi4O12陶瓷上的阻抗谱表明，它们是电异质的，由具有绝缘晶界的半导体晶粒组成。结果表明，C06是最适合设备应用的产品。通过使用扫描电子显微镜对晶界结构进行表面观察和分析，这证实了样品具有明显不同的晶粒尺寸，并且C06具有约20μm的较大晶粒尺寸。与介电弛豫谱相比，在C06上进行了机械弛豫谱，并发现了机械损耗峰，这是由于晶粒中固有的热活化行为所致。

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