4.7 Article

Anisotropic Growth and Magnetic Properties of α-Fe16N2@C Nanocones

Journal

NANOMATERIALS
Volume 11, Issue 4, Pages -

Publisher

MDPI
DOI: 10.3390/nano11040890

Keywords

alpha ''-Fe16N2; permanent magnetic material; one-dimensional nanocones; core/shell structure; anisotropic growth; chemical solution method

Funding

  1. Future Materials Discovery Program through the National Research Foundation of Korea (NRF) - Ministry of Science and Technology and ICT [2016M3D1A1027835]
  2. National Natural Science Foundation of China [51971221, 52031014]
  3. National Key R&D Program of China from the ministry of Science and Technology of China [2017YFA0206302, 2017YFA0700702]

Ask authors/readers for more resources

A new one-pot microemulsion method was developed to synthesize shape anisotropic α''-Fe16N2@C nanocones at low temperatures, exhibiting high coercivity performance. The anisotropic growth of nanocones was driven by magnetocrystalline anisotropy energy and magnetostatic energy, resulting in a unique fan-like microstructure.
alpha ''-Fe16N2 nanomaterials with a shape anisotropy for high coercivity performance are of interest in potential applications such as rare-earth-free permanent magnets, which are difficult to synthesize in situ anisotropic growth. Here, we develop a new and facile one-pot microemulsion method with Fe(CO)(5) as the iron source and tetraethylenepentamine (TEPA) as the N/C source at low synthesis temperatures to fabricate carbon-coated tetragonal alpha ''-Fe16N2 nanocones. Magnetocrystalline anisotropy energy is suggested as the driving force for the anisotropic growth of alpha ''-Fe16N2@C nanocones because the easy magnetization direction of tetragonal alpha ''-Fe16N2 nanocrystals is along the c axis. The alpha ''-Fe16N2@C nanocones agglomerate to form a fan-like microstructure, in which the thin ends of nanocones direct to its center, due to the magnetostatic energy. The lengths of alpha ''-Fe16N2@C nanocones are similar to 200 nm and the diameters vary from similar to 10 nm on one end to similar to 40 nm on the other end. Carbon shells with a thickness of 2-3 nm protect alpha ''-Fe16N2 nanocones from oxidation in air atmosphere. The alpha ''-Fe16N2@C nanocones synthesized at 433 K show a room-temperature saturation magnetization of 82.6 emu/g and a coercive force of 320 Oe.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.7
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available