Effect of PH on Dielectric Properties of CaCu3Ti4O12 Ceramics by Coprecipitation
CaCu3Ti4O12 ceramics were prepared by coprecipitation method. The pH value of reaction solutions plays an important role in the coprecipitation process. First, the pH value of Ti precursor solution must be controlled at around 3, in order to get clear Ti solution. In addition, the pH value of Ca and Cu precursor solution has a great influence on the properties of both precursor and CaCu3Ti4O12 ceramics obtained subsequently. The properties change a lot, even when the pH value of Ca and Cu solution changes in a small range. It can be seem from the XRD patterns that the content of the impurity phase increases with increasing pH value. As to the microstructure, the grain size of CaCu3Ti4O12 ceramics decreases with increasing pH value. Most significantly, the nonlinear coefficient, dielectric constant and loss can all be adjusted by this pH value. Relatively high dielectric constant and low loss can be obtained when this pH value is 5.10. This gives us a clue to improve the properties of CaCu3Ti4O12 ceramics which has been investigated for several years.
Yan Yang Shengtao Li
State Key Laboratory of Electrical Insulation and Power Equipment,Xian Jiaotong University,28 Xianning Road West,Xi’an,710049,China
国际会议
西安
英文
426-429
2009-08-23（万方平台首次上网日期，不代表论文的发表时间）