共沉淀法制备CaCu3Ti4O12陶瓷
收稿日期: 2009-11-03
修回日期: 2010-02-02
网络出版日期: 2010-07-19
基金资助
国家杰出青年科学基金(50625721); 国家自然科学基金(50972118)
CaCu3Ti4O12 Ceramics Prepared by Coprecipitation Method
Received date: 2009-11-03
Revised date: 2010-02-02
Online published: 2010-07-19
为了降低CaCu3Ti4O12陶瓷的介电损耗, 保持高介电常数, 采用共沉淀法制备CaCu3Ti4O12陶瓷. 研究了前驱粉料的热分解过程、煅烧后粉料的物相结构、陶瓷的显微结构和介电性能, 并考察了Ca、Cu混合溶液pH值对CaCu3Ti4O12陶瓷性能的影响. 结果表明: 当Ca、Cu混合溶液pH值为5.1时, 制备的CaCu3Ti4O12陶瓷介电损耗最低, 而且能保持高介电常数. 在室温下, 频率为1kHz时, 介电常数为1.4×104, 介电损耗为0.037. 通过对陶瓷性能对比, 发现共沉淀反应中各元素的沉淀比例, 陶瓷的微观结构和介电性能均受该pH值的影响. 因此, Ca、Cu混合溶液的pH值对降低CaCu3Ti4O12陶瓷介电损耗、保持高介电常数影响很大.
关键词： CaCu3Ti4O12陶瓷; 共沉淀; pH值; 介电损耗
杨 雁, 李盛涛 . 共沉淀法制备CaCu3Ti4O12陶瓷[J]. 无机材料学报, 2010 , 25(8) : 835 -839 . DOI: 10.3724/SP.J.1077.2010.00835
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
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