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Issue 39, 2012
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Facile synthesis of superparamagnetic Ni–Fe ultrafine nanoalloy nanoparticles with equilibrium ordered phase structure via a sol–gel process

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Abstract

Ni–Fe nanoalloy nanoparticles with an average grain size of 4 nm in diameter have been prepared by a sol–gel method under a hydrogen atmosphere where ethanol and oleic acid have been used as solvent and surfactant, respectively. X-ray diffraction (XRD) and selected area electron diffraction (SAED) examinations of the nanoparticles show the occurrence of (111), (200), (220) and (311) diffraction peaks and rings, meaning that the nanoparticles have a face-centered-cubic phase structure. Moreover, a superlattice diffraction peak and a diffraction ring/spot can also be observed in XRD and SAED results, indicating the formation of an equilibrium ordered L12 phase structure. The as-prepared Ni–Fe nanoalloy particles show typical superparamagnetic behavior at room temperature and the blocking temperature of the nanoparticles is determined to be about 50 K.

Graphical abstract: Facile synthesis of superparamagnetic Ni–Fe ultrafine nanoalloy nanoparticles with equilibrium ordered phase structure via a sol–gel process

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Publication details

The article was received on 04 Dec 2011, accepted on 06 Aug 2012 and first published on 06 Aug 2012


Article type: Paper
DOI: 10.1039/C2DT31484C
Citation: Dalton Trans., 2012,41, 12101-12105
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    Facile synthesis of superparamagnetic Ni–Fe ultrafine nanoalloy nanoparticles with equilibrium ordered phase structure via a sol–gel process

    P. Y. Li, Z. H. Cao and X. K. Meng, Dalton Trans., 2012, 41, 12101
    DOI: 10.1039/C2DT31484C

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