Synthesis of Magnetic Nickel Ferrite Microspheres and Their Microwave Absorbing Properties

作     者：JIAO Qingze WANG Yanfeng HAO Liang LI Hansheng ZHAO Yun 

作者机构：School of Chemical Engineering and Environment Beijing Institute of Technology Beijing 100081 P. R. China School of Chemical Engineering and Materials Science Beijing Institute of Technology Zhuhai Zhuhai 519085 P. R. China 

出 版 物：《Chemical Research in Chinese Universities》 (高等学校化学研究（英文版）)

年 卷 期：2016年第32卷第4期

页      面：678-681页

核心收录：

学科分类：080801[工学-电机与电器] 0808[工学-电气工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：Supported by the National Natural Science Foundation of China(Nos.21376029  21071017) 

主　　题：Nickel ferrite microsphere Magnetic property Microwave absorption property 

摘      要：NiFe2O4 microspheres were synthesized using a solvothermal method. The morphologies and structures of NiFe2O4 micropheres were characterized via a field emission scanning electron microscope（FESEM）, a transmission electron microscope（TEM） and an X-ray diffractometer（XRD）. The NiFe2O4 microspheres were around 150--200 nm in diameter and assembled by nanoparticles. The magnetic and electromagnetic parameters were measured using a vibrating sample magnetometer and a vector network analyzer, respectively. The obtained products exhibited a saturation magnetization of 60.8 A.m2·kg-1 at room temperature. A minimum reflection loss（RL） of -27.8 dB was observed at 9.2 GHz with a thickness of 3.5 mm, and the effective absorption frequency（RL〈-10 dB） ranged from 8.2 GHz to 11.2 GHz, indicating the excellent microwave absorption performance of the NiFe2O4 microspheres in the X-band frequencies.