BaCe_(0.5)Zr_(0.4)Y_(0.1)O_(3-δ)粉体的溶胶-凝胶法和高温固相法制备及性能表征  

Preparation and Characterization of BaCe_(0.5)Zr_(0.4)Y_(0.1)O_(3-δ) via Sol-Gel Method and Solid State Reaction

作　　者：张翠娟[1] 赵海雷[1] 王治峰[1] 李雪[1] 沈薇[1] 

机构地区：[1]北京科技大学材料科学与工程学院无机非金属材料系,北京100083

出　　处：《中国稀土学报》2008年第4期409-415,共7页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金资助项目

摘　　要：分别通过溶胶-凝胶法和高温固相反应法制备了BaCe0.5Zr0.4Y0.1O3-δ粉体。采用热重-差热分析(TG-DTA),粉末X射线衍射(XRD),扫描电子显微镜(SEM),傅立叶红外衍射(FT-IR),N2吸附-脱附等方法对所制备的粉体进行了表征。结果表明:用溶胶-凝胶法在1200℃×10 h可以合成纯的BaCe0.5Zr0.4Y0.1O3-δ粉体,合成温度比传统的高温固相反应法降低400℃左右;溶胶-凝胶法合成粉体具有多孔结构特征,与固相法合成粉体相比具有较高的比表面积。但致密化试验表明:溶胶-凝胶法合成粉体与固相法合成粉体相比具有较低的烧结活性。溶胶-凝胶法合成粉体颗粒表面残余的有机基团和颗粒内部的大量微孔将在致密化过程中产生空间位阻,从而影响高温下原子的迁移,阻碍材料的致密化过程。BaCe0.5Zr0.4Y0.1O3-δ powders used as high temperature proton conductor were synthesized through sol-gel method and solid state reaction. The thermogravimetric analysis-differential thermal analysis （TGDTA）, powder X-ray diffraction （ XRD ）, scanning electron microscopy（SEM）, Fourier transform infrared （FT-IR） spectrophotometer, nitrogen adsorption desorption were used to characterize the synthesized powders. The results revealed that the pure BaCe0.5Zr0.4Y0.1O3-δ phase could be synthesized at 1200℃ via sol-gel method, which was about 400℃ lower than that of traditional solid state reaction. The BaCe0.5Zr0.4Y0.1O3-δ powders via sol-gel showed a porous structure and thus had a relatively high specific surface area compared with the powders via solid state reaction. However, sintering experiments indicated that the powders via sol-gel exhibited a rather poor sintering activity compared to that via solid state reaction. The possible organic groups remaining on the particle surface of sol-gel powders and the micropores inside the particles would produce space resistance during the sintering process, which might affect the atomic propagation and thus impede the densification process.

关 键 词：高温质子导体 BaCe0.5Zr0.4Y0.1O3-δ 溶胶-凝胶法 高温固相反应法 稀土 

分 类 号：O614.33[理学—无机化学]