Origin of the colossal permittivity and possible application of CCT ceramics

The coprecipitation, a "soft chemistry" method is used to elaborate different CCT powders. After sintering three main types of materials were obtained: a monophased consisting of the pure CCT phase, a biphased (CCT + CaTiO/sub 3/), and a three-phased (CCT + CaTiO/sub 3/ + copper oxide (CuO or Cu/sub 2/O)). Values of the relative permittivity up to 8 10/sup 5/ at 1 kHz may be obtained for the real part of the permittivity in some cases. The influence of the structure (presence of additional phases) on the dielectric properties of the ceramics is discussed.