锰锌铁氧体纳米晶的水热晶化机理

来源期刊：中南大学学报(自然科学版)2002年第4期

论文作者：桑商斌 古映莹 黄可龙

文章页码：367 - 370

关键词：水热法;锰锌铁氧体纳米晶;添加剂;生长基元

Key words：hydrothermal process; MnZn ferrite nanoscale particle; additive; growth unit

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.

Abstract: The formation mechanismof 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.