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Abstract: Cobalt carbide nanoparticles were processed using polyol reduction chemistrythat offers high product yields in a cost effective single-step process.Particles are shown to be acicular in morphology and typically assembled asclusters with room temperature coercivities greater than 4 kOe and maximumenergy products greater than 20 KJ-m3. Consisting of Co3C and Co2C phases, theratio of phase volume, particle size, and particle morphology all playimportant roles in determining permanent magnet properties. Further, theacicular particle shape provides an enhancement to the coercivity via dipolaranisotropy energy as well as offering potential for particle alignment innanocomposite cores. While Curie temperatures are near 510K at temperaturesapproaching 700 K the carbide powders experience an irreversible dissociationto metallic cobalt and carbon thus limiting operational temperatures to nearroom temperature.



Autor: V.G. Harris, Y. Chen, A. Yang, S. Yoon, Z. Chen, Anton Geiler, C.N. Chinnasamy, L.H. Lewis, C. Vittoria, E.E. Carpenter, K. J. Ca

Fuente: https://arxiv.org/



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