CaCu_3Ti_4O_(12) Ceramics Prepared by Coprecipitation Method

In order to reduce the dielectric loss and retain the high dielectric constant,CaCu_3Ti_4O_(12) ceramics were prepared by coprecipitation method.The thermal decomposition process of precursor was studied by TG/DTG and FTIR.The CaCu_3Ti_4O_(12) phase structure was confirmed by X-ray diffraction.The dielectric spectra and I-V characteristics were measured at room temperature.Ca-Cu solutions with different pH values were used.It is found that when the pH value of Ca-Cu solutions is 5.1,the dielectric constant of the CaCu_3Ti_4O_(12) ceramics is still high and dielectric loss reaches the lowest.At room temperature,the dielectric constant is 1.4×l0~4 and the dielectric loss is 0.037,when the frequency is 1kHz.The precipitation of each element,microstructure and dielectric properties of ceramics are affected by the pH value of Ca-Cu solution.Thus the pH value of Ca-Cu solution is one of the key points to decrease dielectric loss and improve dielectric constant of the CaCu_3Ti_4O_(12) ceramics.