Synthesis, morphology, thermal stability and magnetic properties of α″-Fe16N2 nanoparticles obtained by hydrogen reduction of γ-Fe2O3 and subsequent nitrogenation

Dirba, Imants; Schwöbel, C. A.; Diop, L.V.B.; Duerrschnabel, Michael; Molina‐Luna, Leopoldo; Hofmann, Kathrin; Komissinskiy, Philipp; Kleebe, Hans‐Joachim; Gutfleisch, Oliver

doi:10.1016/j.actamat.2016.10.061

Cited by 43 publications

(29 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…9 The most common synthesis route for iron nitride nanoparticles is nitridation of nanoparticles of elemental iron, iron oxides or hydroxides using ammonia gas. 9,11 Physical methods such as reactive sputtering lead to thin films. 12,13 Liquid ammonia is an exotic but versatile solvent that can be used in organic and inorganic reactions.…”

Section: Introductionmentioning

confidence: 99%

Nanoscale Iron Nitride, ε-Fe₃N: Preparation from Liquid Ammonia and Magnetic Properties

et al. 2017

View full text Add to dashboard Cite

e-Fe 3 N shows interesting magnetism but is difficult to obtain as a pure and single-phase sample. We report a new preparation method using the reduction of iron(II) bromide with elemental sodium in liquid ammonia at -78 °C, followed by annealing at 573 K. Nanostructured and monophasic oxygen-free iron nitride, e-Fe 3 N, is produced according to X-ray diffraction and transmission electron microscopy experiments. The magnetic properties between 2 K and 625 K were characterized using a vibrating sample magnetometer, revealing soft ferromagnetic behavior with a low-temperature average moment of 1.5 µ B /Fe and a Curie temperature of 500 K. T C is lower than that of bulk e-Fe 3 N (575 K), 1 which corresponds well with the small particle size within the agglomerates (15.4 (± 4.1) nm according to TEM, 15.8(1) according to XRD). Samples were analyzed before and after partial oxidation (Fe 3 N-Fe x O y core-shell nanoparticles with a 2-3 nm thick shell) by X-ray diffraction, transmission electron microscopy, electron energy-loss spectroscopy and magnetic measurements. Both the pristine Fe 3 N nanoparticles and the oxidized core-shell particles showed shifting and broadening of the magnetic hysteresis loops upon cooling in a magnetic field.

show abstract

Section: Introductionmentioning

confidence: 99%

Nanoscale Iron Nitride, ε-Fe₃N: Preparation from Liquid Ammonia and Magnetic Properties

et al. 2017

View full text Add to dashboard Cite

show abstract

“…There were several successful efforts to synthesize a 00 -Fe 16 N 2 nanoparticles (NPs) and powders in the past. [11][12][13][14][15] Recently, a 00 -Fe 16 N 2 in bulk form with relatively high coercivity (H c ) were also reported. 15,16 All these properties make a 00 -Fe 16 N 2 a promising candidate for rare-earth-free PMs.…”

Section: Introductionmentioning

confidence: 99%

“…23,24 In the following decades, many research groups reported similar results. 13,25,26 Core-shell structured a 00 -Fe 16 N 2 NPs were also synthesized using the low-temperature nitridation method, where the oxide shells were used to magnetically isolate a 00 -Fe 16 N 2 NPs and enhance the H c . 11,27 Up to now, only NPs, however, are used for the low-temperature nitridation method since they have a much higher surface to volume ratio that provides a higher nitridation efficiency.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of α′′-Fe₁₆N₂ribbons with a porous structure

et al. 2019

View full text Add to dashboard Cite

show abstract

“…However, the production of such foils is costly, and bulk magnet synthesis is not feasible. Current research on the subject focuses on the successful production of working Fe 16 N 2 [ 18,20–27 ] permanent magnets. The main drawback to the production of bulk Fe 16 N 2 permanent magnets is that the α″‐Fe 16 N 2 body centered tetragonal (BCT) phase ( Figure ) responsible for the GSM is unstable above 212 °C; [ 7 ] therefore, the usual permanent magnet production routes, involving treatment at high temperature, [ 1 ] cannot be used.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of Fe₁₆N₂Micro‐Flake Powders and Their Extrusion‐Based 3D Printing into Permanent Magnet Form

et al. 2020

View full text Add to dashboard Cite

Fe16N2 is a compound with giant saturation magnetization approaching or exceeding that of rare‐earth‐based permanent magnets. The abundance of its elements and low‐cost synthesis of this compound has made it highly attractive to replace rare‐earth‐based permanent magnets that are becoming ever more expensive to utilize in applications. Herein, its synthesis from Fe flakes by surfactant‐assisted high energy ball milling is demonstrated. The synthesized Fe flakes are then reduced under forming gas (Ar/H2), followed by nitridation at low temperatures under ammonia (NH3) gas. The formation of Fe16N2 phase exceeding 50% by volumetric fraction is observed and confirmed by X‐ray diffraction and Mössbauer analysis. Following the Fe16N2 flake synthesis, extrusion‐based 3D printing is used to check the feasibility of incorporation of the flakes into functional polymer matrix composites. For this purpose, an ink of intermixed synthesized powder with photoresist SU8 is used. Using the prescribed method, a prototype Fe16N2 permanent magnet composite is successfully produced using an additive manufacturing approach. Such efficient production of Fe16N2 powders via routes already applicable to magnet production and the consolidation of the powders with 3D printing are expected to open up new possibilities for next‐generation permanent magnet applications.

show abstract

Synthesis, morphology, thermal stability and magnetic properties of α″-Fe16N2 nanoparticles obtained by hydrogen reduction of γ-Fe2O3 and subsequent nitrogenation

Cited by 43 publications

References 35 publications

Nanoscale Iron Nitride, ε-Fe₃N: Preparation from Liquid Ammonia and Magnetic Properties

Nanoscale Iron Nitride, ε-Fe₃N: Preparation from Liquid Ammonia and Magnetic Properties

Synthesis of α′′-Fe₁₆N₂ribbons with a porous structure

Fabrication and Characterization of Fe₁₆N₂Micro‐Flake Powders and Their Extrusion‐Based 3D Printing into Permanent Magnet Form

Contact Info

Product

Resources

About

Synthesis, morphology, thermal stability and magnetic properties of α″-Fe16N2 nanoparticles obtained by hydrogen reduction of γ-Fe2O3 and subsequent nitrogenation

Cited by 43 publications

References 35 publications

Nanoscale Iron Nitride, ε-Fe3N: Preparation from Liquid Ammonia and Magnetic Properties

Nanoscale Iron Nitride, ε-Fe3N: Preparation from Liquid Ammonia and Magnetic Properties

Synthesis of α′′-Fe16N2ribbons with a porous structure

Fabrication and Characterization of Fe16N2Micro‐Flake Powders and Their Extrusion‐Based 3D Printing into Permanent Magnet Form

Contact Info

Product

Resources

About

Nanoscale Iron Nitride, ε-Fe₃N: Preparation from Liquid Ammonia and Magnetic Properties

Nanoscale Iron Nitride, ε-Fe₃N: Preparation from Liquid Ammonia and Magnetic Properties

Synthesis of α′′-Fe₁₆N₂ribbons with a porous structure

Fabrication and Characterization of Fe₁₆N₂Micro‐Flake Powders and Their Extrusion‐Based 3D Printing into Permanent Magnet Form