Journal of Inorganic Materials >
CaCu3Ti4O12 Ceramics Prepared by Coprecipitation Method
Received date: 2009-11-03
Revised date: 2010-02-02
Online published: 2010-07-19
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 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 CaCu3Ti4O12 ceramics.
Key words： CaCu3Ti4O12; coprecipitation; pH value; dielectric loss
YANG Yan, LI Sheng-Tao . CaCu3Ti4O12 Ceramics Prepared by Coprecipitation Method[J]. Journal of Inorganic Materials, 2010 , 25(8) : 835 -839 . DOI: 10.3724/SP.J.1077.2010.00835
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