Magnetic properties and scale-up of nanostructured cobalt carbide permanent magnetic powders

Journal Article · Wed May 07 00:00:00 EDT 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4868334· OSTI ID:22273750

Zamanpour, Mehdi; Bennett, Steven; Taheri, Parisa; Chen, Yajie ^[1]; Harris, Vincent G. ^[1]

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1. Center for Microwave Magnetic Materials and Integrated Circuits, Northeastern University, Boston, Massachusetts 02115 (United States)

Co{sub x}C magnetic nanoparticles were successfully synthesized via a modified polyol process without using a rare-earth catalyst during the synthesis process. The present results show admixtures of Co{sub 2}C and Co{sub 3}C phases possessing magnetization values exceeding 45 emu/g and coercivity values exceeding 2.3 kOe at room temperature. Moreover, these experiments have illuminated the important role of surfactants, reaction temperature, and reaction duration on the crystallographic structure and magnetic properties of Co{sub x}C, while tetraethylene glycol was employed as a reducing agent. The role of the ratios of Co{sub 2}C and Co{sub 3}C phases in the admixture magnetic properties is discussed. The crystallographic structure and particle size of the Co{sub x}C nanoparticles were characterized by X-ray diffractometry and scanning electron microscopy. Vibrating sample magnetometry was used to determine magnetic properties. Scale-up of synthesis to more than 5 g per batch was demonstrated with no significant degradation of magnetic properties.

• OSTI ID: 22273750
• Journal Information: Journal of Applied Physics, Vol. 115, Issue 17; Conference: 55. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 14-18 Nov 2010; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
77 NANOSCIENCE AND NANOTECHNOLOGY
COBALT CARBIDES
COERCIVE FORCE
CRYSTAL STRUCTURE
MAGNETIC MATERIALS
MAGNETIC PROPERTIES
MAGNETIZATION
NANOSTRUCTURES
PARTICLE SIZE
PARTICLES
POWDERS
RARE EARTHS
SCANNING ELECTRON MICROSCOPY
SYNTHESIS
TEMPERATURE RANGE 0273-0400 K
X-RAY DIFFRACTION