Microcontact measurement is employed to locally investigate the electric and dielectric properties of individual grains and grain boundaries in CaCu3Ti4O12 ceramic. The measurements give more detail of the impedance spectroscopy, capacitance, and I-V characteristics of the microstructure, and will help with further understanding of the mechanism of the electric and dielectric properties of CaCu3Ti4O12 ceramics.
By sintering CaCu3Ti4O12ceramics at different temperatures and testing the samples＇ properties, the segregation behavior of Cu and its effects were carefully studied. As the temperature rises, CuO segregates to the grain boundaries and gradually volatilize. Complete decomposition and volatilization occur at 1150℃. The behavior of CuO is found to be closely related to the formation of the grain boundary barrier, as well as the acquirement and evolution of the electrical properties, which are revealed in the research.
