胶凝剂对NiFe_2O_4纳米粉末制备及磁性能的影响  

Effects of Gelling Agents on Synthesis and Magnetic Property of NiFe_2O_4 Nanoparticles

作　　者：孔小东[1] 朱梅五[1] 郑家燊[2] 

机构地区：[1]海军工程大学基础部,武汉430033 [2]华中科技大学化学系,武汉430074

出　　处：《宇航材料工艺》2004年第3期34-38,共5页Aerospace Materials & Technology

摘　　要：采用溶胶 -凝胶法制备NiFe2 O4 纳米粉末 ,胶凝剂分别采用柠檬酸和PEG2 0 0 ,测定了样品的TG -DTA曲线、红外吸收光谱、X射线衍射谱和磁性能。结果表明 ,采用不同的胶凝剂 ,NiFe2 O4 纳米粉末制备过程中出现明显不同的物理和化学变化 ;2 0 0℃以上的热处理促进粉末的长大和晶化过程 ,随着温度的升高 ,晶化程度增强 ,粉末粒径增大 ;NiFe2 O4 纳米粉末的磁性能与热处理温度、粉末的粒径大小及磁性测量样品装载条件等密切相关。NiFe 2O 4 Nanoparticles are synthesized with sol gel method. The gelling agents are citric acid and PEG200, respectively. The TG DTA curves, infrared absorption transmittance spectra, XRD spectra and magnetic properties are measured. It can be found that there are different physical and chemical changes in processes of synthesis for different gelling agents. The particles would grow up and crystallize with annealed treatment above 200℃. And the higher the annealed temperature, the more the crystallization, and the size of particles is the bigger. The magnetic properties of NiFe 2O 4 nanoparticles are related closely to the annealed temperature, particle size and loading condition of specimen for measurement.

关 键 词：胶凝剂 NiFe2O4纳米粉末 制备 磁性能 软磁铁氧体 

分 类 号：TM277[一般工业技术—材料科学与工程]