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

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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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Authors and Affiliations

  1. College of Metallurgy and Materials Engineering, Chongqing University of Science and Technology, Chongqing, 401331, People’s Republic of China

    Bin Shao, Ying He, Jiaqi Lai, Dengming Chen, Donglin Guo & Yilong Ma

  2. The Center of Material Analysis and Testing, Chongqing University of Science and Technology, Chongqing, 401331, People’s Republic of China

    Bin Shao, Dengming Chen & Donglin Guo

Authors
  1. Bin Shao
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  2. Ying He
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  3. Jiaqi Lai
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  4. Dengming Chen
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  5. Donglin Guo
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  6. Yilong Ma
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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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