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Size-dependent structural and magnetic properties of chemically synthesized Co-Ni-Ga nanoparticles

MPS-Authors
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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,  Jinfeng
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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ViolBarbosa,  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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Rohlicek,  Jan
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., Karel, J., Fabbrici, S., Qian, J., ViolBarbosa, C. E., et al. (2017). Size-dependent structural and magnetic properties of chemically synthesized Co-Ni-Ga nanoparticles. Nano Research, 10(10), 3421-3433. doi:10.1007/s12274-017-1554-y.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002D-F4F5-4
Abstract
Phase transitions and magnetic properties of shape-memory materials can be tailored by tuning the size of the constituent materials, such as nanoparticles. However, owing to the lack of suitable synthetic methods for size-controlled Heusler nanoparticles, there is no report on the size dependence of their properties and functionalities. In this contribution, we present the first chemical synthesis of size-selected Co-Ni-Ga Heusler nanoparticles. We also report the structure and magnetic properties of the biphasic Co-Ni-Ga nanoparticles with sizes in the range of 30-84 nm, prepared by a SBA-15 nanoporous silicatemplated approach. The particle sizes could be readily tuned by controlling the loading and concentration of the precursors. The fractions and crystallite sizes of each phase of the Co-Ni-Ga nanoparticles are closely related to their particle size. Enhanced magnetization and decreased coercivity are observed with increasing particle size. The Curie temperature (T (c)) of the Co-Ni-Ga nanoparticles also depends on their size. The 84 nm-sized particles exhibit the highest T (c) (ae 1,174 K) among all known Heusler compounds. The very high Curie temperatures of the Co-Ni-Ga nanoparticles render them promising candidates for application in high-temperature shape memory alloy-based devices.