低温固相法反应制备NiFe_2O_4的研究

Preparation of NiFe_2O_4 by Low Temperature Solid State Reaction Method

铁酸镍作为一类重要的磁性氧化物,因其具有优异的性能,而被广泛应用于许多领域。它还可作为磁致伸缩材料,因其还具有耐高温,高强度,高硬度,热稳定性好的优点,也可用作性能优良的陶瓷材料,同时它还是一种优质的催化剂可以用作CO2的分解反应。笔者以NiO和Fe_2O_3为原料,采用微波加热和传统电阻炉加热的方式制备铁酸镍尖晶石粉末,并利用扫描电镜和XRD等方法对合成的铁酸镍粉体进行观察和分析。实验结果表明:保温时间,烧成温度对反应的进行有着重要的影响;微波加热合成方式和传统电阻炉加热合成方式相比,它具有合成速度快的优点,另外微波合成的粉体晶粒尺寸分布范围窄,而传统加热方式的粉体晶粒尺寸分布范围比较宽,但合成粉体的质量不如微波加热方式合成的粉体。

Ferrite is an important class of magnetic oxides,it has smaller expansion coefficient,and good of thermal stability.So it is widely used in many fields,such as magnetic head material,the magnetic moment of the material and microwave absorbing materials.Also used as a magnetostrictive material.Because of its good advantages of high temperature,high strength,high hardness,thermal stability.Also used as a ceramic material with excellent performance.It is also a good catalyst can be used as a decomposition reaction of CO2.The nickel ferrite spinel powders were prepared by microwave heating and electric heating in solid-phase reaction route,while NiO and Fe2O3 as raw materials.The NiFe2O4 powders were observed and analyzed with SEM and XRD equipment,the results indicated that the firing temperature and holding time have a significant impact on the reaction.Comparative with microwave heating and electric heating mode,the former synthesis is faster and has a narrow grain size,meanwhile with a good quality.