物理化学学报2011，Vol.27Issue(12)：2927-2932,6.DOI:10.3866/PKU.WHXB20112927
钛酸钡纳米颗粒聚集球的形成机理
Formation Mechanism of Barium Titanate Nanoparticle Aggregations
摘要
Abstract
A novel nanoparticle aggregation structure of barium titanate was obtained by the hydrothermal method. Powder X-ray diffraction (XRD) revealed that the aggregates crystallized in the cubic phase. The crystallization of the products became more significant with reaction progress. The growth characteristics of the aggregates was further confirmed by scanning electron microscopy (SEM), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), and electron diffraction (ED) spectroscopy. The aggregation was composed of many 5-8 nm nanoparticles by orientation attachment and we found that the ED patterns indicated a single-crystal property for the aggregates. The size of the aggregates was about 60 nm and they grew as the reaction continued. From the results of energy dispersive X-ray (EDX) spectroscopy analysis and kinetics modeling using the Johnson-Mehl-Avrami (JMA) equation, the diffusion nucleation of Ba2* ion was found to be dominant during the early stages of aggregation formation. The growth process of "diffusion nucleation-orientation attachment" revealed the formation mechanism of barium titanate nanoparticle aggregations.关键词
钛酸钡/JMA方程/水热法/扩散机理/定向生长Key words
Barium titanate/ JMA equation/ Hydrothermal method/ Diffusion mechanism/ Orientation attachment分类
化学化工引用本文复制引用
展红全,江向平,李小红,罗志云,陈超,李月明..钛酸钡纳米颗粒聚集球的形成机理[J].物理化学学报,2011,27(12):2927-2932,6.基金项目
国家自然科学基金(91022027,51062005,50862005)资助项目 （91022027,51062005,50862005）
