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中文摘要：
通过溶胶—凝胶法制备CaCu3Ti4O12干凝胶，再经700-900℃，6-10h预烧和950-1100℃，16-20h烧结，成功制备了CaCu3Ti4012粉体和CaCu3Ti4O12巨介电常数陶瓷材料。用X射线衍射、扫描电镜分别确定了样品的结晶性能和形貌。用阻抗分析仪在10-10^6Hz范围内测试了陶瓷样品的介电性能。结果表明：粉体的结晶性能与煅烧温度有关，陶瓷介电性能与其晶粒大小有关。相对于传统固相反应合成法制备的粉体和陶瓷，粉体的预烧和陶瓷的烧结温度都有明显降低，烧成温度至少降低100℃。在800℃预烧的CaCu3Ti4O12粉体并在1100℃温度下烧结制备的陶瓷，其介电常数可达194753。
英文摘要：
CaCuaTi4O12 ceramics with giant dielectric constants were successfully prepared by sintering at 950-1100℃ for 20h and using a powder prepared by the sol-gel method and calcined at 700-900℃ for 6-10 h. The phase structures of CaCu3Ti4O12 ceramics and precursor powders were measured by X-ray diffraction, and the morphology of CaCu3Ti4O12 ceramics was observed by scanning electron microscopy. The dielectric constant of CaCu3Ti4O12 was measured by an inductance-capacitance-resistance （ICR） meter at a frequency range from 10 Hz to 106 Hz. The results show that the dielectric constant of the CaCu3Ti4O12 ceramics is dependent on the grain size of the perovskite-like phase. The calcination temperatures of the precursor powders prepared by sol-gel method and the sintering temperature of CaCuaTi4O12 ceramics are at least 100℃lower than that by the traditional solid phase reaction process. A CaCu3Ti4O12 ceramic with a dielectric constant of 194753 was obtained by sintering at 1100℃ and using the powder calcined at 800 ℃, which is much higher than that prepared by the traditional solid phase reaction process.
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