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

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

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

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

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Qian,  Jin-Feng
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Viol Barbosa,  Carlos E.
Inorganic Chemistry, 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;

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Schnelle,  Walter
Walter Schnelle, 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;

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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., 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.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002B-9ACF-5
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.