不同条件锰锌铁氧体纳米晶形成机理及物性研究  

The research on the mechanism of formation and property of MnZn ferrite nanocrystallite in different condition

作　　者：王健[1] 郁黎明[1] 袁淑娟[1] 徐坤[1] 张建花[1] 曹世勋[1] 张金仓[1] 

机构地区：[1]上海大学物理系,上海200444

出　　处：《功能材料》2008年第1期119-122,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(10504019;10674092;10574087);上海市科学技术委员会纳米科技计划资助项目(0652nm046)

摘　　要：硝酸盐-柠檬酸溶胶凝胶低温燃烧合成获得锰锌铁氧体(MZF)纳米晶。采用TG-DTA、XRD、VSM对前驱体凝胶燃烧过程及产物磁性能进行表征。结果表明,凝胶pH值不同,反应自燃燃点温度也不同,约变化12℃。气氛对于280℃前凝胶热分解过程没有影响,但在280℃后对物相形成有较大影响。pH值调节剂种类对凝胶燃烧进程,反应剧烈程度及磁性能有很大影响,且可以通过调节剂的种类得到不同粒径的纳米晶锰锌铁氧体粉体。MnZn ferrites （MZF） nanocrystal were synthesized by sol-gel and auto-combustion method. The formation mechanisms and the products of flame-combusting dried citrate precursors were investigated via TGDTA, XRD,and VSM techniques. The results show that the ignition point of auto-combustion vary with the value of pH about increasing 12℃ for sufficiency combustion. The atmospheres play little part in heat decomposition of the gel before 280℃,but important role for the formation of phase in the anaphase. The combustion process and magnetic property are greatly influenced by the species of pH adjusting agent; The system adjusted by ethylenediamine reacted slowly,and we can control the MnZn ferrites（MZF）nanocrystal sizes through the variation of pH adjusting agent.

关 键 词：热分析 锰锌铁氧体 自燃 溶胶凝胶 气氛 

分 类 号：TF123[冶金工程—粉末冶金]