Development of CaCu₃Ti₄O₁₂ ceramics with giant dielectric constant

CaCu₃Ti₄O₁₂ (CCTO) ceramics possess giant dielectric constant and high thermal stability, which makes it possible for CCTO to be used widely in high-density information storage, colossal dielectric capacitor, and electronic components. In this paper, research progress of CCTO ceramics at home and abroad is reviewed. The origin mechanism of the giant dielectric constant of CCTO ceramics, including the internal mechanism and the outside mechanism, is discussed. The influence on dielectric properties of doping in grain or at grain boundary is compared. After detailed analysis, the correctness of the mechanism of pseudo polarization by grain conduction is confirmed and the effective way of reducing dielectric loss of CCTO is proposed.