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Nano-Architecture of Facetted NiFe2O4/(Ni,Fe)O Particles Produced by Induction Plasma

Abstract

Facetted nickel ferrite (NiFe2O4) and bunsenite [(Ni,Fe)O] nanocrystals were grown from the decomposition of iron and nickel nitrate precursors using an inductively coupled plasma reactor. The full range of the two-phase region of the Fe2O3–NiO pseudo-equilibrium phase diagram was investigated by producing nanopowders with bulk Ni/(Ni + Fe) ratios of 0.33, 0.4, 0.5, 0.75 and 1.0. A Ni-poor [Ni/(Ni + Fe) ≤ 0.5] precursor solution produced truncated octahedron nanocrystals, whereas nanocubes were obtained at higher ratios [Ni/(Ni + Fe) ≈ 1]. In both cases, it is shown that the nanocrystals adopt a morphology close to the Wulff shape of the crystalline system (spinel and NaCl, respectively). As the bulk Ni/(Ni + Fe) ratio increases from 0.33 (the stoechiometric composition of nickel ferrite), bunsenite is epitaxially segregated on the {110} and {111} facets of nickel ferrite, while leaving the NiFe2O4 {100} facets exposed. A precursor solution at a Ni/(Ni + Fe) ratio of 0.75 gave an (Ni,Fe)O-rich nanopowder with a random and irregular interconnected morphology. The structure of these nanocrystals can be understood in terms of their thermal history in the plasma reactor. These results highlights the possibility of producing organized multi-phased nanomaterials of binary systems having two phases stable at high temperatures, using a method known to be easily scalable.

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Acknowledgments

The authors would like to extend their most sincere thanks to François Gitzhofer and Kossi E. Béré for their technical help, Federico Rosei for providing valuable insight on this manuscript, as well as NSERC, CFI, FRQNT, the Plasma-Québec network and the Canada Research Chair program for funding this research.

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Correspondence to Nadi Braidy.

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Bastien, S., Ricolleau, C. & Braidy, N. Nano-Architecture of Facetted NiFe2O4/(Ni,Fe)O Particles Produced by Induction Plasma. Plasma Chem Plasma Process 36, 1349–1362 (2016). https://doi.org/10.1007/s11090-016-9730-5

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Keywords

  • Induction plasma
  • Multi-phased
  • Nanoparticles
  • TEM