基于溶胶-凝胶法制备BaTiO3基PTCR纳米陶瓷粉体研究  

Research on nano-ceramic PTCR powders of BaTiO3 made by sol-gel method

作　　者：陈勇[1,2] 龚树萍[1] 黎慧[1] 王法军[1] 余石金[1] 徐玲芳[2] 

机构地区：[1]华中科技大学电子科学与技术系,湖北武汉430074 [2]湖北大学物理学与电子技术学院暨铁电压电材料与器件湖北省重点实验室,湖北武汉430062

出　　处：《功能材料》2007年第A02期617-620,共4页Journal of Functional Materials

基　　金：国家自然科学基金重点资助项目（60676050）;湖北大学铁电、压电材料与器件湖北省重点实验室开放基金资助项目（2007TY10）;湖北省耐火材料与高温陶瓷重点实验室一省部共建国家重点实验室培育基地开放基金资助项目（G0606）.

摘　　要：以溶胶-凝胶法制备了BaTiO3基PTCR纳米陶瓷粉体，通过适当控制材料的掺杂量和烧成制度达到细化晶粒、降低烧结温度及降低室温率的目的。讨论了溶胶．凝胶过程中水的加入量、乙酸加入量、乙醇加入量、成胶温度对形成细晶粉体的影响，制备出的BaTiO3粉体具有纯度高、粒径小、均匀性好、活性高、热处理温度低等优点。R-T丁曲线表明1260℃较1240℃烧结具有高的升阻比、温度系数，低的电阻率、居里温度：XRD分析表明所得粉体与BaTiO3主峰相吻合；800℃预烧2h所得BaTiO3粉体的TEM图表明粉体分布较均匀、外形为近似球形，其平均晶粒尺寸约30nm左右，与XRD得到的晶粒相当，单个颗粒是单晶；1240℃下烧结所得样品的SEM图片看出样品的平均晶粒约1～2μm、晶粒较为均匀致密。Based on sol-gel method nano-ceramic powder was made. Through appropriate control of doping materials and firing system small-size grain was prepared. Lowering the sintering temperature and room temperature the purpose of reducing the rate of resistance was realized. In the text the sol-gel process of accession to the volume of water, acetic acid content, alcohol content, gelling temperature was discussed. BaTiO3 powders through sol-gel method had high purity and small size, uniformity, and high activity, low temperature coefficient. R-T curve showed that the sample sintered at 1260℃ had a higher jump ratio of resistance and temperature coefficient, lower resistance and Curie temperature than sintered at 1240℃; XRD analysis showed that the peak of the powders and BaTiO3 coincided; The TEM map showed the BaTiO3powder pre-sintered at 800℃ for 2 h had an uniform distribution, approximate spherical shape, and the average grain size was about 30 nm, which had considerable grain size by XRD analysis. So the individual particle was single crystal; the average grain size of the sample sintered at 1240℃ was about 1～2μm, grain was dense seeing from SEM picture.

关 键 词：溶胶-凝胶法 BATIO3 PTCR 细晶 

分 类 号：TN304[电子电信—物理电子学]