软磁锰锌铁氧体的晶粒生长动力学实验分析  

Study on Crystallization Knetics Mechanism of Soft-Magnetic MnZn Ferrite

作　　者：刘春静[1] 王新[1] 魏雨[2] 姜延飞[1] 杨玉[1] 

机构地区：[1]河北工业大学,天津300130 [2]河北师范大学,河北石家庄050016

出　　处：《稀有金属材料与工程》2009年第A01期515-519,共5页Rare Metal Materials and Engineering

基　　金：天津市自然科学基金(08JCYBJC27000);河北省自然科学基金(E2007000059)资助

摘　　要：用共沉淀相转化法合成出的纳米锰锌铁氧体粉体经柠檬酸进行表面处理,压制成环型后经两步烧结得到烧结样品。用XRD、SEM以及VSM等方法对烧结样品进行了表征,并用球模型烧结方程探讨了烧结过程中的晶粒生长机制,结果表明锰锌铁氧体的晶粒生长指数n≈2,表观生长激活能Q=71.14kJ/mol,由此可知锰锌铁氧体在烧结过程中的晶粒生长主要受晶界迁移机制控制。当烧结温度为1000℃时,锰锌铁氧体样品已达到理论密度的94%,其磁性能较好。The sintering MnZn ferrite was gained by two-step sintering process, which was composited from the nano-sized MnZn ferrite powders treated with citrate acid. The samples were characterized by XRD, SEM and VSM. According to the sintering equation of diffusion mechanism deduced by sphere model, the grain growth exponent n and the apparent activation energy Q were estimated to be 2 and 71.14 kJ/mol respectively. It is shown that the grain growth is controlled by crystal boundary migration mechanism. The magnetic properties of the sample are satisfied at 1000℃ and the relative density is 94% of the theoretical value.

关 键 词：锰锌铁氧体 烧结 动力学 活化能 

分 类 号：O782[理学—晶体学]