Chemical Synthesis and Characterization of γ-Co2NiGa Nanoparticles with a Very High Curie Temperature

Wang C, Levin AA, Nasi L, Fabbrici S, Qian J, Barbosa CEV, Ouardi S, Karel J, Albertini F, Borrmann H, Fecher GH, Felser C (2015)

Publication Type: Journal article

Publication year: 2015

Journal

Chemistry of Materials American Chemical Society

Book Volume: 27

Pages Range: 6994-7002

Journal Issue: 20

DOI: 10.1021/acs.chemmater.5b02227

Abstract

We report the first study on the chemical preparation, structural characterization, and magnetic properties of Co2NiGa nanoparticles (NPs) of a single γ-phase (γ-Co2NiGa). The γ-Co2NiGa NPs were prepared by impregnation in colloidal silica followed by high temperature annealing under hydrogen atmosphere. The crystal structure of tetragonal γ-Co2NiGa was confirmed by selected area electron and X-ray diffraction studies. Energy-dispersive X-ray spectroscopy mapping and X-ray absorption near edge structure data provided evidence for the successful preparation of the intermetallic NPs and the absence of Co, Ni, Co-Ni, or metal-containing impurity phases. Extended X-ray absorption fine structure spectroscopy data confirmed the formation of the γ-Co2NiGa phase by examining the atomic environments surrounding Co, Ni, and Ga. The Co2NiGa NPs are ferromagnetic with a high saturation magnetization, which is consistent with the theoretical model. γ-Co2NiGa NPs exhibit a very high Curie temperature (≈1139 K), which make them promising candidates for high temperature magnetically activated nanoscale devices.

Involved external institutions

Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids DE Germany (DE) Consiglio Nazionale delle Ricerche (CNR) / National Research Council of Italy IT Italy (IT)

How to cite

APA:

Wang, C., Levin, A.A., Nasi, L., Fabbrici, S., Qian, J., Barbosa, C.E.V.,... Felser, C. (2015). Chemical Synthesis and Characterization of γ-Co2NiGa Nanoparticles with a Very High Curie Temperature. Chemistry of Materials, 27(20), 6994-7002. https://doi.org/10.1021/acs.chemmater.5b02227

MLA:

Wang, Changhai, et al. "Chemical Synthesis and Characterization of γ-Co2NiGa Nanoparticles with a Very High Curie Temperature." Chemistry of Materials 27.20 (2015): 6994-7002.

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