Preparation of Ni1 − xFex nanoparticles with a composition gradient and a proposed formation mechanism

Abstract

Ni-Fe alloy nanoparticles were able to be prepared by a one-step hydrazine reduction, where the formation mechanism is unclear. In this paper, Ni1xFex nanoparticles with a composition gradient were prepared, and the change in composition gradient in the Ni1 − xFex nanoparticles was found to be affected by Fe content. Furthermore, it was surprising that the increase in Fe content significantly increased the formation rate of Ni1 − xFex nanoparticles, which was difficult to explain via thermodynamics. By further analyzing the element distribution and microstructure of the intermediate products of the Ni1 − xFex nanoparticles, a formation mechanism was proposed for the Ni1 − xFex nanoparticles. In this formation mechanism, Ni1 − xFex(OH)2 was confirmed as the reduced intermediate, and the composition distribution of the Ni1 − xFex nanoparticles was primarily controlled by reaction kinetics. Finally, the existence of the composition gradient in the Ni1 − xFex nanoparticles had a great effect on their coercivity, due to the change in internal stress. This work provides a reference for preparation and a performance study of alloy nanoparticles with a composition gradient.

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Funding

This work was supported by National Key R&D Program of China (Grant No. 2018YFC0115202) and Science, Technology Research Project of Chong Qing Education Commission (Grant No. KJZD-M201801501).

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Correspondence to Dengming Chen.

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Shao, B., He, Y., Lai, J. et al. Preparation of Ni1 − xFex nanoparticles with a composition gradient and a proposed formation mechanism. J Nanopart Res 22, 165 (2020). https://doi.org/10.1007/s11051-020-04850-6

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Keywords

  • Ni-Fe alloy
  • Nanoparticles
  • Composition gradient
  • Formation mechanism