摘要
利用共沉淀法合成了钴铁氧体及钕(Nd)取代钴铁氧体,研究了Nd取代对钴铁氧体纳米粒子结构、磁性及电磁波吸收性能的影响。X射线衍射(XRD)和透射电镜(TEM)结果表明,当Nd取代量较低时,可以起到细化晶粒的作用,但是当取代量x≥0.06时,会产生二次相NdFeO_(3),并导致晶粒尺寸变大。磁性能研究结果表明,适量的Nd取代钴铁氧体可以提升材料的矫顽力(H_(c))和磁晶各向异性,这对于提升钴铁氧体的电磁波吸收性能起到了关键作用,磁损耗(C0)和衰减常数有效提升导致电磁波吸收性能增强。相比于钴铁氧体,CoFe_(1.96)Nd_(0.04)O_(4)的反射损耗值提高了61.46%,有效吸收频带拓宽了1.02 GHz。
High-frequency devices with frequencies up to gigahertz have extreme advantages such as long-distance response,fewer wires,and high-speed response,realizing the interconnection of everything.The electromagnetic radiation and interference generated by these high-frequency smart devices,that is,electromagnetic pollution,has become a new type of pollution source after water,atmosphere,and noise.Its characteristic is that it interferes with the normal communication of electromagnetic devices and causes great harm to the human body,and it is not easy to protect.In recent years,cobalt ferrite has been widely used in the field of electromagnetic pollution prevention because of its high coercivity and resistivity,suitable saturation magnetization,large magnetocrystalline anisotropy,good chemical stability,and high Curie temperature.However,cobalt ferrite cannot obtain excellent electromagnetic wave absorption performance and application limitations due to poor impedance matching and high density.Rare earth elements have a large magnetic moment and magnetocrystalline anisotropy due to their special electronic structure,which makes them widely used in a variety of materials.Doping a small amount of trivalent rare-earth ions into spinel ferrite is a promising method to improve its electromagnetic properties.In this paper,cetyltrimethylammonium bromide was used as a surfactant,C_(4)H_(6)CoO_(4)·6H_(2)O,FeCl_(3)·6H_(2)O,and NdCl_(3)·6H_(2)O were used as raw materials to synthesize spinel-type nano-cobalt ferrite with Nd substitution by the co-precipitation method.For cobalt ferrite,the substitution amount of Nd was x(x=0,0.02,0.04,0.06 and 0.08).X-ray diffractometer(XRD),transmission electron microscope(TEM),inductively coupled plasma emission spectrometer(ICP-OES),vibrating sample magnetometer(VSM)and vector network analyzer(VNA)were used to character samples,the research focused on the substitution of Nd ions influence on the microstructure,magnetic properties and electromagnetic wave absorption properties of cobalt ferr
作者
高静
马志军
刘福立
翁兴媛
程亮
周智静
Gao Jing;Ma Zhijun;Liu Fuli;Weng Xingyuan;Cheng Liang;Zhou Zhijing(School of Mining,Liaoning Technical University,Liaoning 123000,China;School of Chemical and Environmental Engineering,China University of Mining and Technology,Beijing 100083,China)
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2024年第3期440-447,共8页
Chinese Journal of Rare Metals
基金
国家自然科学基金项目(51372108,52274265)资助。
关键词
钴铁氧体
钕
共沉淀
电磁波吸收
cobalt ferrite
neodymium
coprecipitation
electromagnetic wave absorption
