溶胶-凝胶法制备的Ba_(0.8)Sr_(0.2)TiO_3薄膜的结构及铁电性质研究  

STRUCTURE AND FERROELECTRICITY OF Ba_(0.8)Sr_(0.2)TiO_3 THIN FILMS PREPARED BY A MODIFIED SOL-GEL PROCESSING 

作　　者：程建功[1] 孟祥建[1] 唐军[1] 郭少令[1] 褚君浩[1] 

机构地区：[1]中国科学院上海技术物理研究所红外物理国家实验室,上海200083

出　　处：《物理学报》2000年第5期1006-1009,共4页Acta Physica Sinica

基　　金：国家自然科学基金!(批准号 :6973 80 2 0 )重点资助的课题&&

摘　　要：采用 0 0 5mol/L的前驱体溶液 ,利用溶胶 凝胶法成功制备了室温下具有优良铁电性质的Ba0 .8Sr0 .2 TiO3(BST)薄膜 .X射线衍射分析表明 ,制得的BST薄膜室温下呈四方相 ,场发射扫描电子显微观测显示BST薄膜表面平整、致密、无裂纹出现 ,薄膜晶粒呈柱状结构、尺寸在 15 0nm左右 .电学测量表明制备的BST薄膜室温下具有优良的铁电性能 .薄膜的剩余极化Pr 约为 3 5 μC/cm2 ,矫顽电场Ec 约为 5 3kV/cm .薄膜的绝缘性能也较好 .这为利用溶胶Quality Ba 0.8 Sr\-\{0.2\}TiO\-3 (BST) thin films with a remnant polarization of about 3.5?μC/cm 2,and a coercive field of about 53?kV/cm have been successfully prepared by a sol\|gel processing using a 0.05?mol/L precursor solution.X\|ray diffraction and field emission scanning electron microscope investigations show that the BST films exhibit a tetragonal structure ( c/a =1.009) and consist dominantly of large columnar grains of about 150?nm in diameter.The observed good ferroelectricity and insulating property render the sol\|gel derived BST thin films promising for uncooled infrared detector and thermal imaging applications.

关 键 词：溶胶-凝胶法 BST薄膜 结构 铁电性质 

分 类 号：O484[理学—固体物理]