溶胶-凝胶法制备0.1BiFeO_3-0.9SrBi_2Nb_2O_9铁电薄膜的结构和光学性质研究  

Structure and optical properties of BiFeO_3-SrBi_2Nb_2O_9 thin films using a modified sol-gel technique

作　　者：杨向荣[1] 顾豪爽[1] 胡永明[1] 尤晶[1] 袁颖[1] 胡正龙[1] 

机构地区：[1]湖北大学物理学与电子技术学院,湖北武汉430062

出　　处：《功能材料》2007年第9期1437-1439,共3页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50572026);湖北省自然科学基金创新群体资助项目(2005ABC008)

摘　　要：采用硝酸铋[Bi(NO3)3.5H2O]、硝酸锶[Sr(NO3)2]、硝酸铁[Fe(NO3)3.9H2O]和乙醇铌[Nb(OC2H5)5]作为起始原料,乙二醇甲醚[C3H8O2]作为溶剂配制掺Fe的SrBi2Nb2O9前驱体溶液,利用溶胶-凝胶法在石英衬底上制备出0.1BiFeO3-0.9 Sr-Bi2Nb2O9铁电薄膜。研究了该薄膜的表面形貌、组分、晶体结构和光学性质。结果表明,经400℃退火后薄膜为非晶结构,而在空气中经600℃退火1h后,沉积的薄膜晶化成钙钛矿结构。制备的薄膜表面平整,颗粒分布均匀,表现出良好的光透过性,该薄膜的光学能隙大约为2.5eV。Fe-doped SrBi2 Nb2 O9 sol was synthesized using bismuth nitrate hydrate Bi（NO3 ）3 · 5H2O9 strontium nitrate Sr（NO3）2,iron nitrate Fe（NO3）3 · 9H2O9 and niobium ethoxide Nb（OC2H5 ）5 as starting materials, ethylene glycol monomethyl ether （C3H8O2） as the solvent. 0.1BiFeO3-0.9SrBi2Nb2O9 thin films were prepared on fused quartz substrates using sol-gel processing. The surface morphology, composition, crystal structure and optical properties of the thin films were investigated. The thin film annealing at 400℃ were found to be amorphous,and the thin films crystallize to a perovskite structure after a post-deposition annealing at 600℃ for lh in air. The grain of thin film was evenly distributed. The thin films exhibit the designed optical transmission,while the optical transition is indirect in nature. Their optical bandgap is about 2.5eV.

关 键 词：BiFeO3一SrBi2Nb2O9 铁电薄膜 溶胶-凝胶 光学性质 

分 类 号：TN304[电子电信—物理电子学]