Abstract
Cubic perovskite-related ceramic CaCu3Ti4O12 has avery high dielectric constant larger than 10000 in the kilohertzfrequency region. It is almost constant in the 100–600 K region. Theceramic compounds were prepared by conventional solid-state reaction atdifferent sintering temperatures 1040 degrees C(C04),1060 degrees C(C06), 1080 degrees C(C08), and 1100 degrees C(C10).Impedance spectroscopy on CaCusTi4O12 ceramicsdemonstrates that they are electrically heterogeneous and consist ofsemi-conducting grains with insulating grain boundaries. It is shownthat C06 is the most suitable one for device applications. Surfaceobservation and analysis of the grain-boundary-grained structure werecarried out by using scanning electron microscopy, which confirms thatthe samples have clearly different crystal grain sizes and C06 has alarger grain size of about 20 μm. Compared to the dielectric relaxationspectroscopy, the mechanical relaxation spectroscopy on C06 wasperformed and a mechanical loss peak was found, which was attributed tothe thermally activated behaviour being immanent in the grains.
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