锰离子掺杂纳米镍锌铁氧体的制备及其吸波性能研究  

Preparation of manganese ion doped nano-Ni-Zn ferrites and their microwave absorption properties

作　　者：刘旺冠 郭建华[1,2] 董洪坤 蒋兴华 LIU Wangguan;GUO Jianhua;DONG Hongkun;JIANG Xinghua(School of Materials Science and Engineering,South China University of Technology,Guangzhou 510640,China;Institute of Modern Industrial Technology of SCUT in Zhongshan,Zhongshan 528400,China;School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]华南理工大学材料科学与工程学院,广东广州510640 [2]中山市华南理工大学现代产业技术研究院,广东中山528400 [3]华南理工大学机械与汽车工程学院,广东广州510640

出　　处：《高校化学工程学报》2023年第4期615-622,共8页Journal of Chemical Engineering of Chinese Universities

基　　金：广东省自然科学基金(2018A0303130023);中山市科技计划(2019AG022,2020AG022)。

摘　　要：采用水热法制备锰离子掺杂纳米镍锌铁氧体(即镍锰锌铁氧体),采用X射线衍射(XRD)、扫描电子显微镜(SEM)、综合物性测量系统(PPMS)分析表征铁氧体的结构和磁性,研究镍锌铁氧体和镍锰锌铁氧体的元素配比对吸波性能的影响。结果表明,4种铁氧体均呈类球状,粒径较均匀。其中镍锰锌铁氧体的磁饱和强度与矫顽力最大,分别为84.97 A·m^(2)·kg^(-1)和7.44×10^(-)3 T。镍锰锌铁氧体具有最佳的吸波性能,当镍锰锌铁氧体/石蜡复合物的厚度为8.62 mm,且频率为3.87 GHz时,最小反射损耗RL,min为-41.77 dB。当样品厚度为8.09 mm时,最大吸收带宽E_(AB,max)为3.1 GHz。镍锌锰铁氧体的吸波机制主要归因于极化引起的传导损耗以及自然共振与涡流共振产生的磁损耗。Manganese-doped nano-Ni-Zn ferrites were synthesized by a hydrothermal method.The structure and magnetism of nickel-zinc(Ni-Zn)ferrites and nickel-manganese-zinc(Ni-Mn-Zn)ferrites were characterized by diffraction of X-rays diffraction(XRD),scanning electron microscopy(SEM)and physical property measurement system(PPMS)analysis.Effects of element ratio of Ni-Zn and Ni-Mn-Zn ferrites on the microwave absorption properties was investigated.The results show that the four ferrites are spherical-like with relatively uniform particle sizes.The Ni-Mn-Zn ferrite have the maximum magnetic saturation strength and coercive force(84.97 A·m^(2)·kg^(-1)and 7.44×10^(-3)T,respectively).It also shows the best microwave absorption properties.When the thickness of the Ni-Mn-Zn ferrite/paraffin composite was 8.62 mm and the frequency was 3.87 GHz,the minimum reflection loss R_(L,min)was-41.77 dB.When the thickness was 8.09 mm,the maximum effective absorption bandwidth EAB,max was 3.1 GHz.The microwave absorption mechanism is mainly ascribed to the conduction loss due to polarization and the magnetic loss due to natural resonance and eddy current resonance.

关 键 词：铁氧体 掺杂 水热法 吸波性能 

分 类 号：TM277.1[一般工业技术—材料科学与工程]