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  Tunable structural and magnetic properties of chemically synthesized dual-phase Co2NiGa nanoparticles

Wang, C., Levin, A. A., Fabbrici, S., Nasi, L., Karel, J., Qian, J.-F., et al. (2016). Tunable structural and magnetic properties of chemically synthesized dual-phase Co2NiGa nanoparticles. Journal of Materials Chemistry C: Materials for Optical and Electronic Devices, 4(30), 7241-7252. doi:10.1039/c6tc01757f.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-9ACF-5 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-F7BE-A
Genre: Journal Article

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 Creators:
Wang, Changhai1, Author              
Levin, Aleksandr A.2, Author              
Fabbrici, Simone3, Author
Nasi, Lucia3, Author
Karel, Julie4, Author              
Qian, Jin-Feng1, Author              
Viol Barbosa, Carlos E.1, Author              
Ouardi, Siham5, Author              
Albertini, Franca3, Author
Schnelle, Walter6, Author              
Borrmann, Horst7, Author              
Fecher, Gerhard H.8, Author              
Felser, Claudia9, 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              
4Julie Karel, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863434              
5Siham Ouardi, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863439              
6Walter Schnelle, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863441              
7Horst Borrmann, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863410              
8Gerhard Fecher, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863431              
9Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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 Abstract: We report the structural and magnetic properties of chemically synthesized dual-phase Co2NiGa shape memory Heusler nanoparticles (NPs). Rietveld analysis of the X-ray diffraction (XRD) data reveals a dual-phase structure for all studied Co2NiGa NPs: the B2 ordered cubic austenite (beta) and the tetragonal (gamma or martensite beta') phases. We find that the fraction of the tetragonal gamma-phase and magnetic properties of NPs consisting of beta + gamma phases prepared using a heating rate of 0.5 K min(-1) can be tuned by varying the Ni-content. Higher saturation magnetization and Curie temperature are observed for Co2NiGa NPs with a higher fraction of the gamma-phase. Dual-phase beta + gamma Co2NiGa NPs exhibit the highest Curie temperature (1153 K) of all known Heusler NPs. Furthermore, the martensite beta'-phase is found to coexist with the beta-phase for NPs synthesized using a higher heating rate of 2 K min(-1). Co2NiGa NPs of mixed beta + beta' phase are paramagnetic at room temperature and exhibit low magnetization due to the presence of the martensite phase. High temperature XRD measurements of Co2NiGa NPs with beta + beta' phases confirm their irreversible phase transition of the beta-phase starting at a temperature of 837 K and the structural stability of the tetragonal beta'-phase. The developed new synthetic method makes it possible to fabricate Co2NiGa NPs with structure and properties tailored for high temperature magnetic shape memory devices at the nanoscale.

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Language(s): eng - English
 Dates: 2016-07-052016-07-05
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: ISI: 000381434400007
DOI: 10.1039/c6tc01757f
 Degree: -

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Title: Journal of Materials Chemistry C: Materials for Optical and Electronic Devices
  Other : J. Mater. Chem. C
Source Genre: Journal
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Publ. Info: London, UK : Royal Society of Chemistry
Pages: - Volume / Issue: 4 (30) Sequence Number: - Start / End Page: 7241 - 7252 Identifier: ISSN: 2050-7526
CoNE: /journals/resource/2050-7526