Synthesis and Structure of Magnetic Core-shell Ni–Ce Nanocomposite Particles

Authors: Sun X-C.¹; Toledo J.A.¹; Cui Z.L.²; Zhang Z.K.²

Source: Journal of Nanoparticle Research, Volume 3, Number 4, August 2001 , pp. 325-328(4)

Publisher: Springer

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Abstract:

A new type of magnetic core-shell Ni–Ce nanocomposite particles (15–50 nm) is presented. SEM observations suggest the particles are strongly ferromagnetic, interacting with ordered chain-like features. Typical HR-TEM images demonstrate that many planar defects (nanotwins and stacking faults) exist in the surface shell and large Ni core zone (10–40 nm) of the particles; the inner shell layers (4–6 nm) consist of NiCe alloy and the outermost shell is NiO. Nano-diffraction patterns show an indication of well-defined spots characteristic of nanocomposite materials, of which certain crystal facet orientation relationships between orthorhombic [111] of NiCe and cubic [311] of Ni_2Ce, face-center crystal [222] of NiO, cubic [111] of nickel have been identified. This confirms the nature of this core-shell nanocomposite particle.

Keywords: magnetic; nanocomposite; core-shell; Ni–Ce; transmission electron microscopy; twin faults

Language: English

Document Type: Regular paper

Affiliations: 1: Prog. Simulación Molecular, Instituto Mexican Del Petróleo (IMP), Lázaro Cárdenas 152, 07730, México D.F., México (Fax: +525-333-6239; E-mail: sunxiangcheng@yahoo.com) 2: Research Center Of Nano-meter Material, Qingdao Institute Of Chemical Technology, 266042 Qingdao, P.R. China

Publication date: 2001-08-01