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

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.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-1D9B-9 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-F7E2-7
Genre: Journal Article

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 Creators:
Wang, Changhai1, Author              
Levin, Aleksandr A.2, Author              
Nasi, Lucia3, Author
Fabbrici, Simone3, Author
Qian, Jinfeng1, Author              
ViolBarbosa, Carlos E.1, Author              
Ouardi, Siham4, Author              
Karel, J.5, Author              
Albertini, Franca3, Author
Borrmann, Horst6, Author              
Fecher, Gerhard H.7, Author              
Felser, Claudia8, Author              
Affiliations:
1Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
2Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863405              
3External Organizations, ou_persistent22              
4Siham Ouardi, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863439              
5Julie Karel, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863434              
6Horst Borrmann, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863410              
7Gerhard Fecher, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863431              
8Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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 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.

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Language(s): eng - English
 Dates: 2015-10-082015-10-27
 Publication Status: Published in print
 Pages: -
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Title: Chemistry of Materials
  Other : Chem. Mater.
Source Genre: Journal
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Publ. Info: Washington, D.C. : American Chemical Society
Pages: - Volume / Issue: 27 (20) Sequence Number: - Start / End Page: 6994 - 7002 Identifier: ISSN: 0897-4756
CoNE: /journals/resource/954925561571