Size-dependent structural and magnetic properties of chemically synthesized Co-Ni-Ga nanoparticles
Wang C, Levin AA, Karel J, Fabbrici S, Qian J, Violbarbosa CE, Ouardi S, Albertini F, Schnelle W, Rohlicek J, Fecher GH, Felser C (2017)
Publication Type: Journal article
Publication year: 2017
Journal
Book Volume: 10
Pages Range: 3421-3433
Journal Issue: 10
DOI: 10.1007/s12274-017-1554-y
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 (Tc) of the Co-Ni-Ga nanoparticles also depends on their size. The 84 nm-sized particles exhibit the highest Tc (≈ 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. [Figure not available: see fulltext.].
Involved external institutions
Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids
Germany (DE)
Consiglio Nazionale delle Ricerche (CNR) / National Research Council of Italy
Italy (IT)
MIST E-R Laboratory
Italy (IT)
Germany (DE)
Consiglio Nazionale delle Ricerche (CNR) / National Research Council of Italy
Italy (IT)
MIST E-R Laboratory
Italy (IT)
How to cite
APA:
Wang, C., Levin, A.A., Karel, J., Fabbrici, S., Qian, J., Violbarbosa, C.E.,... Felser, C. (2017). Size-dependent structural and magnetic properties of chemically synthesized Co-Ni-Ga nanoparticles. Nano Research, 10(10), 3421-3433. https://doi.org/10.1007/s12274-017-1554-y
MLA:
Wang, Changhai, et al. "Size-dependent structural and magnetic properties of chemically synthesized Co-Ni-Ga nanoparticles." Nano Research 10.10 (2017): 3421-3433.
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