Process optimization and properties of magnetically hard cobalt carbide nanoparticles via modified polyol method

JOURNAL OF ALLOYS AND COMPOUNDS

卷:625

Article

Zamanpour, Mehdi¹  Bennett, Steven P.¹  Majidi, Leily²  Chen, Yajie¹  Harris, Vincent G.^1,3 

[1] Northeastern Univ, Ctr Microwave Magnet Mat & Integrated Circuits CM, Boston, MA 02115 USA

[2] Northeastern Univ, Dept Mech & Ind Engn, Boston, MA 02115 USA

[3] Northeastern Univ, Dept Elect & Comp Engn, Boston, MA 02115 USA

关键词: Magnetic materials;    Permanent magnets;    Magnetization;    Hard magnets;    Chemical synthesis;   

DOI  :  10.1016/j.jallcom.2014.11.083

来源: Elsevier

【 摘 要 】

Cobalt carbide 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 Co2C and Co3C phases possessing magnetization values exceeding 47 emu/g and coercivity values exceeding 2.3 kOe at room temperature. Moreover, these experiments have illuminated the important role of the reaction temperature, hydroxyl ion concentrations and the reaction duration on the crystallographic structure and magnetic properties of the nanoparticles. The crystallographic structure and particle size of the CoxC 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. (C) 2014 Elsevier B. V. All rights reserved.

【 授权许可】

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