Sol-gel synthesis of Fe-Co nanoparticles and magnetization study

P. Nautiyal (1) , M.M. Seikh (2) , O.I. Lebedev (3) , A.K. Kundu (1)

1 IIIDTM Jabalpur - Indian Institute of Information Technology, Design and Manufacturing
2 Department of Chemistry, Visva Bharati University
3 CRISMAT - Laboratoire de cristallographie et sciences des matériaux

We report the synthesis of carbon encapsulated Fe-Co nanoparticles using conventional sol-gel route and its magnetization studies. The x-ray diffraction indicates the formation of the single phase body centered cubic alloy Fe-Co phase with cell parameter of 2.857 Å. Nanoparticles are highly crystalline and exhibit low index faceting as determined from high-resolution transmission electron microscopy (HRTEM) investigation. The observed orthogonal lattice planes with lattice distance of 2.86 Å are attributed to (100) and (010). HRTEM image confirms the cube like Fe-Co nanoparticles with core-shell structure of carbon encapsulation, composed of carbon and graphite materials. The magnetometry results of the carbon encapsulated alloy Fe-Co nanoparticles with core-shell structure designate as a ferromagnetically ordered soft magnet with coercive field of 890 Oe (at 5 K). The coercive field and magnetization value depend on the size of nanoparticles as well as the diamagnetic contribution of carbon encapsulation. © 2014 Elsevier B.V. All rights reserved.

Mots clés: Electron microscopy; Magnetic properties; Nanostructures; Sol-gel chemistry

Domaines: Chimie; Cristallographie; Matériaux; Chimie théorique et/ou physique

P. Nautiyal, M.M. Seikh, O.I. Lebedev, A.K. Kundu. Sol-gel synthesis of Fe-Co nanoparticles and magnetization study. Journal of Magnetism and Magnetic Materials, 2015, 377, pp.402-405. ⟨10.1016/j.jmmm.2014.10.157⟩. ⟨hal-02184129⟩