摘要
根据配位多面体生长基元理论 ,分析了水热晶化过程中锰锌铁氧体纳米晶生长基元的形成过程 ,以及锰锌铁氧体共沉淀前驱体在水热过程中的溶解与羟基配位体的形成过程 ,探讨了生长基元的形成方式、添加剂对前驱体制备及水热晶化过程的影响 .研究结果表明 :加入添加剂有助于得到均匀的共沉淀前驱体 ,在水热晶化初期有利于羟基配合物均匀分散 ,从而避免出现易于在较低温度就能形成的杂相 ;同时 ,添加剂影响水热过程中生长基元的聚集生长方式 ,第 2类聚集生长占优势 .因此 ,所制备的锰锌铁氧体纳米晶粒径小 ,粒径分布范围窄 .
The formation mechanism of MnZn ferrite nanoscale particle in hydrothermal process is studied with crystal coordination growth unit theory, the formation process of the crystal growth units and the effects of additive are discussed through studying the MnZn ferrite coprecipitation precursors dissolution and hydroxyl coordination polyhedra formation process. The results show that the additive is beneficial to obtain the homogeneous coprecipitation precursors and can disperse the hydroxyl coordination polyhedra formed in the hydrothermal process by combination with hydrogen bond, thus impurity phase is avoided, which can be formed in the hydrothermal process at a lower temperature. Meanwhile, additive has an effect on gathering way of the crystal growth units in the crystallization. The second gathering way is predominant so that the synthesized MnZn ferrite nanoscale crystallite has a tiny size and a small size distribution.
出处
《中南工业大学学报》
CSCD
北大核心
2002年第4期367-370,共4页
Journal of Central South University of Technology(Natural Science)
