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

Wang, Changhai; Levin, Aleksandr A.; Nasi, Lucia; Fabbrici, Simone; Qian, Jinfeng; ViolBarbosa, Carlos E.; Ouardi, Siham; Karel, J.; Albertini, Franca; Borrmann, Horst; Fecher, Gerhard H.; Felser, Claudia

doi:10.1021/acs.chemmater.5b02227

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

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Wang, Changhai
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Levin, Aleksandr A.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons129684

Qian, Jinfeng
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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ViolBarbosa, Carlos E.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Ouardi, Siham
Siham Ouardi, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126680

Karel, J.
Julie Karel, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Borrmann, Horst
Horst Borrmann, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Fecher, Gerhard H.
Gerhard Fecher, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126601

Felser, Claudia
Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

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

Cite as: https://hdl.handle.net/11858/00-001M-0000-0029-1D9B-9

Abstract

We report the first study on the chemical preparation, structural characterization, and magnetic properties of Co2NiGa nanopartides (NPs) of a single gamma-phase (gamma-Co2NiGa). The gamma-Co2NiGa NPs were prepared by impregnation in colloidal silica followed by high temperature annealing under hydrogen atmosphere. The crystal structure of tetragonal gamma-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 gamma-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. gamma-Co2NiGa NPs exhibit a very high Curie temperature (approximate to J1139 K), which make them promising candidates for high temperature magnetically activated nanoscale devices.