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.
出处
《功能材料》
EI
CAS
CSCD
北大核心
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)
