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In situ non-aqueous nucleation and growth of next generation rare-earth-free permanent magnets.
- Source :
-
Physical chemistry chemical physics : PCCP [Phys Chem Chem Phys] 2015 Jan 14; Vol. 17 (2), pp. 1070-6. Date of Electronic Publication: 2014 Nov 21. - Publication Year :
- 2015
-
Abstract
- Using a controllable wet chemical approach, the polyol process, we developed a cobalt carbide nanomagnet consisting of an assembly of Co2C and Co3C nanoparticles as an alternative to rare earth permanent magnets (PMs). The thermodynamically stable mixed phase cobalt carbide nanoparticles are shown to be acicular in morphology. Their exchange-coupled magnetic interaction possessing high maximum energy product of 20.7 kJ m(-3) and room temperature coercivity (2.9 kOe) has been confirmed through vibrating sample magnetometer (VSM) and first order reversal curves (FORCs). These metastable carbide nanoparticles offer improved magnetic properties compared to their pure bulk form. An understanding of the formation mechanism, using in situ time-resolved X-ray spectroscopy (TR-XAS), and the correlation between phase contributions to the properties are described in detail. Our strategy presents a controllable route to preparing the cobalt carbide nanomagnets, which could be potentially useful in permanent magnet clean energy applications. Additionally, the in situ apparatus offers a promising way to directly explore the effects of reaction variables for high-temperature wet chemical reactions.
Details
- Language :
- English
- ISSN :
- 1463-9084
- Volume :
- 17
- Issue :
- 2
- Database :
- MEDLINE
- Journal :
- Physical chemistry chemical physics : PCCP
- Publication Type :
- Academic Journal
- Accession number :
- 25412691
- Full Text :
- https://doi.org/10.1039/c4cp04451g