Synthesis of Samarium-Cobalt Sub-micron Fibers and Their Excellent Hard Magnetic Properties

Frontiers in Chemistry

Nosang V. Myung¹  Jongryoul Kim²  Yong-Ho Choa²  Min Kyu Kang²  Jimin Lee²  Hong-Baek Cho²  Tae-Yeon Hwang² 

[1] Department of Chemical and Environmental Engineering, University of California, Riverside, Riverside, CA, United States;Department of Materials Science and Chemical Engineering, Hanyang University, Ansan, South Korea;

关键词: samarium cobalt;    electrospinning;    fiber;    permanent magnet;    magnetic properties;   

DOI  :  10.3389/fchem.2018.00018

来源: DOAJ

【 摘 要 】

High-throughput synthesis of Samarium-Cobalt sub-micron fibers with controlled composition and dimension was demonstrated by combining electrospinning and reduction-diffusion processes. The composition of fibers was readily varied (8 < Sm < 20 at.%) by adjusting precursor composition whereas the diameter of fibers was precisely controlled by varying electrospinning parameters (e.g., applied voltage, solution feed rate, temperature, and humidity) to reach single-domain size. X-ray diffraction patterns confirmed that single phase Sm2Co17 fibers were synthesized when the metal precursor ratio (Sm3+/(Sm3++Co2+)) was precisely controlled at 10.6%, whereas mixed phases (i.e., Co-Sm2Co17 or Sm2Co17-Sm2Co7) were observed when the ratio is deviated from the stoichiometric. Magnetic saturation (Ms) of the synthesized fibers monotonically decreased with an increased in Sm content. In contrast, coercivity (Hci) monotonically increased with an increase in Sm content.

【 授权许可】

Unknown