Conduction properties of CaCu3Ti4O12

CaCu₃Ti₄O₁₂ were prepared using conventional solid state reaction processing techniques. The structure of CaCu₃Ti₄O₁₂ was confirmed by X-ray diffraction. The microstructure with various grain sizes was characterized by scanning electron microscopy. Different element distributing between grain and grain boundary was detected by energy dispersive X-ray spectrometer. The dielectric spectrum was measured at room temperature. The I-V characteristics of CaCu₃Ti₄O₁₂ were measured in a wide temperature range from 93 K to 373 K. It is found that the nonlinear coefficient varies with temperature and the total conductance can be separated into three parts at various current. The nonlinear coefficient corresponding to each part can be deduced from the conductance-current curve, and then the temperature dependence of the nonlinear coefficient can be explained.