CaCu₃Ti₄O₁₂ ceramics prepared by coprecipitation method

In order to reduce the dielectric loss and retain the high dielectric constant, CaCu₃Ti₄O₁₂ ceramics were prepared by coprecipitation method. The thermal decomposition process of precursor was studied by TG/DTG and FTIR. The CaCu₃Ti₄O₁₂ 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 CaCu₃Ti₄O₁₂ ceramics is still high and dielectric loss reaches the lowest. At room temperature, the dielectric constant is 1.4×10⁴ and the dielectric loss is 0.037, when the frequency is 1 kHz. 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 CaCu₃Ti₄O₁₂ ceramics.