熔盐法由BaO2·H2O2合成BaTiO3纳米粒子及其表征  

Synthesis and characterization of BaTiO_3 nanoparticles from BaO_2·H_2O_2 by molten salt method

作　　者：项尚[1] 朱启安[1] 胡耐根[2] 张超[1] 雍高兵[1] 徐军古[1] 

机构地区：[1]湘潭大学化学学院,环境友好化学与应用省部共建教育部重点实验室,湖南湘潭411105 [2]新余高等专科学校数信系,江西新余338031

出　　处：《功能材料》2010年第7期1165-1168,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50472080);湖南省教育厅科学研究资助项目(06C829)

摘　　要：将BaCl2.2H2O和H2O2溶液在NH3.H2O中反应制备出前驱体BaO2.H2O2,再用H2TiO3和前驱体BaO2.H2O2作反应物、KNO3和KOH作溶剂,用熔盐法合成了钛酸钡纳米粒子,用XRD、SEM、TEM、EDS和FT-IR对产品的结构、形貌和成份进行了表征。结果表明,在500～600℃煅烧24h可获得粒径约为25～50nm的立方相钛酸钡纳米粒子,粒子大小分布均匀,形状近似为球形。随着反应温度升高,BaTiO3纳米粒子的晶胞参数减少、粒径增大。另外,还讨论了BaTiO3纳米粒子的形成机理。The precursor,BaO2·H2O2 were prepared from the reaction of BaCl2·2H2O and H2O2 in NH3·H2O aqueous solution under the ambient condition.BaTiO3 nanoparticles were produced by molten salt method using H2TiO3 and the as-prepared precursor BaO2·H2O2 as reactant,KNO3 and KOH as a flux.XRD,SEM,TEM,EDS and FT-IR techniques were used to characterize the structures,morphologies and compositions of the products.The results show that BaTiO3 nanoparticles with uniform size distribution and particle sizes of 25-50nm,similar to spherical shape,can be obtained through calcining an mixture of the molten salt at 500-600℃ for 24h,and the structures of the as-obtained nanoparticles are of cubic phases.As the increases of reaction temperature,the cell parameters of BaTiO3 nanoparticles decrease,and the crystallite sizes increase.In addition,the formation mechanism of BaTiO3 nanoparticles prepared by molten salt method was also discussed.

关 键 词：熔盐法 钛酸钡 BaO2·H2O2 纳米粒子 

分 类 号：O614.233[理学—无机化学]