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溶胶-凝胶法制备巨介电常数材料CaCu_3Ti_4O_(12)
作者:杨昌辉 周小莉 徐刚 韩高荣 翁文剑 杜丕一  
单位:浙江大学硅材料国家重点实验室 浙江大学硅材料国家重点实验室 浙江大学硅材料国家重点实验室 浙江大学硅材料国家重点实验室 浙江大学硅材料国家重点实验室 浙江大学硅材料国家重点实验室 杭州 310027 杭州 310027 台州学院物理系 浙江 临海 317000 杭州 310027 杭州 310027 杭州 310027 杭州 310027 
关键词:钛酸铜钙  溶胶-凝胶  巨介电常数 
分类号:TB34
出版年,卷(期):页码:2006,34(6):753-756
DOI:
摘要:
通过溶胶-凝胶法制备CaCu3TiO12干凝胶,再经700-900℃,6-10h预烧和950-1100℃,16-20h烧结,成功制备了CaCu3Ti4O12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10~106Hz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1 100℃温度下烧结制备的陶瓷,其介电常数可达194753。
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CaCu3Ti4O12 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 CaCu3Ti4O12 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 1 100 ℃ 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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基金项目:
浙江省科技计划(2005C21119) 国家自然科学基金(50372057和50332030)资助项目
作者简介:
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参考文献:
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