Influence of High-Pressure Nitrogenation on the Structure,Magnetism and Microwave Absorption Properties of SmFe_(10)Mo_2  

作　　者：Nai-Kun Sun Jie Guo Sheng-Jie Du Song-Ning Xu Ping-Zhan Si Jin-Jun Liu 

机构地区：[1]School of Science, Shenyang Ligong University [2]College of Materials Science and Engineering, China Jiliang University [3]Faculty of Materials Science and Chemical Engineering, Ningbo University

出　　处：《Acta Metallurgica Sinica(English Letters)》2015年第6期781-786,共6页金属学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (No. 51261001);Liaoning Provincial Natural Science Foundation (No. 2013020105);Shenyang Science and Technology Foundation (No. F13-316-139)

摘　　要：Nitrogenation of SmFelolVIo2 powders was performed in a self-made furnace under a high-purity N2 atmo- sphere up to 40 MPa at 500 ℃. Upon nitrogenation at atmospheric pressure, the lattice parameters a and c increase by 0.5% and 2.7%, respectively, whereas the Curie temperature Tc increases from 519 to 633 K. With further increasing the nitrogenation pressure to 20 and 40 MPa, the 1：12 main phase starts to decompose and a large amount of Mo and a-Fe precipitates. This leads to variation of Mo concentration in the 1：12 phase and causes a sharp decrease in Tc and in the coercivity. The relative complex permittivity and permeability of paraffin-SmFeloMO2 composites show multi-resonant behavior. After nitrogenation, the magnetic loss of the powders decreases, which may originate from the influence of eddy currents due to the increase in the particle size.Nitrogenation of SmFelolVIo2 powders was performed in a self-made furnace under a high-purity N2 atmo- sphere up to 40 MPa at 500 ℃. Upon nitrogenation at atmospheric pressure, the lattice parameters a and c increase by 0.5% and 2.7%, respectively, whereas the Curie temperature Tc increases from 519 to 633 K. With further increasing the nitrogenation pressure to 20 and 40 MPa, the 1：12 main phase starts to decompose and a large amount of Mo and a-Fe precipitates. This leads to variation of Mo concentration in the 1：12 phase and causes a sharp decrease in Tc and in the coercivity. The relative complex permittivity and permeability of paraffin-SmFeloMO2 composites show multi-resonant behavior. After nitrogenation, the magnetic loss of the powders decreases, which may originate from the influence of eddy currents due to the increase in the particle size.

关 键 词：High-pressure nitrogenation SmFeloMO2-based compounds Curie temperature Microwaveabsorption 

分 类 号：O611.2[理学—无机化学] TB34[理学—化学]