CaCu3Ti4O12 Ceramics Prepared by Coprecipitation Method

doi:10.3724/SP.J.1077.2010.00835

Abstract

Abstract:

In order to reduce the dielectric loss and retain the high dielectric constant, CaCu₃Ti₄O₁₂ceramics were prepared by coprecipitation method. The thermal decomposition process of precursor was studied by TG/DTG and FTIR. The CaCu₃Ti₄O₁₂phase 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 CaCu₃Ti₄O₁₂ceramics 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 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 CaCu₃Ti₄O₁₂ceramics.

Key words: CaCu₃Ti₄O₁₂, coprecipitation, pH value, dielectric loss

CLC Number:

TM283

YANG Yan, LI Sheng-Tao. CaCu₃Ti₄O₁₂ Ceramics Prepared by Coprecipitation Method[J]. Journal of Inorganic Materials, 2010, 25(8): 835-839.

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CaCu₃Ti₄O₁₂ Ceramics Prepared by Coprecipitation Method

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