中文摘要：

用草酸共沉淀法在700℃保温1h制备出了单相CaCu3Ti4O12粉体．经1000℃热处理2h得到致密的CaCu3Ti4O12陶瓷．与传统的固相反应相比，该方法具有反应时间短与温度低的特征．用差热和热重法分析了沉淀前驱物的分解过程，用X射线衍射和扫描电子显微镜进行了物相分析并观察了样品的表面形貌，并用精密阻抗分析仪对样品进行电学性质测量．结果表明，该陶瓷有着稳定的介电性质，在10^3～10^6Hz的频率范围内，相对介电常数约为10^4，介电损耗小于0．35．

英文摘要：

The giant dielectric constant material CaCu3Ti4O12 （CCTO） powder has been fabricated successfully by an oxalate coprecipitation method. The compact CCTO ceramic was obtained after sintering at 1 000 ℃ for 2 hours. Compared with the traditional solid-state reaction method, the former method has the advantages of Shorter time for reaction （1 hour）, lower temperature （700 ℃）. DTA/TGA （differential thermal analysis/thermogravimetry analysis） was carried out on as-dried precursor to study the thermal decomposition process. The crystalline phase of CCTO was confirmed by X-ray diffraction （XRD）. The morphology of the ceramic was observed using a scanning electron microscopy （SEM）, and the electrical properties of the ceramic were measured by a precision impedance analyzer. It is found that the present CaCu3 Ti4 O12 （CCTO） material exhibits stable dielectric properties. The comparative dielectric constant is about 10^4 , and the dielectric loss is smaller than 0.35 in the frequencies range from 10^3 to 10^6 Hz.