Synthesis of α′′-Fe<sub>16</sub>N<sub>2</sub>ribbons with a porous structure

Liu, Jinming; Guo, Guannan; Zhang, Fan; Wu, Yiming; Ma, Bin; Wang, Jian Ping

doi:10.1039/c9na00008a

Cited by 22 publications

(16 citation statements)

References 34 publications

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“…the article of Kim and takahashi in 1972 [18] reported on high magnetization in α″Fe 16 N 2 has inspired many groups of scientists all over the world to explore the material. Motivated and encouraged by the promising magnetic properties that α″Fe 16 N 2 phase demonstrates, re searchers undertook quite a few attempts to study theoretically and experimentally this phase and prepare (through different synthesis techniques) the samples with as possible larger its volume fraction [46][47][48][49][50][51][52][53][54][55][56][57][58] (see also references in recent reviews [1,2]).…”

Section: Fabrication Methods and Structurementioning

confidence: 99%

Martensitic αʺ-Fe16N2-Type Phase of Non-Stoichiometric Composition: Current Status of Research and Microscopic Statistical-Thermodynamic Model

Radchenko¹,

Gatsenko²,

Lizunov³

et al. 2020

Usp. Fiz. Met.

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The literature (experimental and theoretical) data on the tetragonality of martensite with interstitial–substitutional alloying elements and vacancies are reviewed and analysed. Special attention is paid to the studying the martensitic αʺ-Fe16N2-type phase with unique and promising magnetic properties as an alternative to the rare-earth intermetallics or permendur on the world market of the production of permanent magnets. The period since its discovery to the current status of research is covered. A statistical-thermodynamic model of ‘hybrid’ interstitial–substitutional solid solution based on a b.c.t. crystal lattice, where the alloying non-metal constituents (impurity atoms) can occupy both interstices and vacant sites of the host b.c.c.(t.)-lattice, is elaborated. The discrete (atomic-crystalline) lattice structure, the anisotropy of elasticity, and the ‘blocking’ and strain-induced (including ‘size’) effects in the interatomic interactions are taken into account. The model is adapted for the non-stoichiometric phase of Fe–N martensite maximally ordered by analogy with αʺ-Fe16N2, where nitrogen atoms are in the interstices and at the sites of b.c.t. iron above the Curie point. It is stressed an importance of adequate data on the available (in the literature) temperature- and concentration-dependent microscopic energy parameters of the interactions of atoms and vacancies. The features of varying (viz. non-monotonic decreasing with increasing temperature) the relative concentration of N atoms in the octahedral interstices of b.c.t. Fe, and therefore, the degree of its tetragonality (correlating with this concentration) are elucidated. Within the wide range of varying the total content of introduced N atoms, the ratio of the equilibrium concentration of residual site vacancies to the concentration of thermally activated vacancies in a pure b.c.c. Fe is demonstrated at a fixed temperature.

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Section: Fabrication Methods and Structurementioning

confidence: 99%

Martensitic αʺ-Fe16N2-Type Phase of Non-Stoichiometric Composition: Current Status of Research and Microscopic Statistical-Thermodynamic Model

Radchenko¹,

Gatsenko²,

Lizunov³

et al. 2020

Usp. Fiz. Met.

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“…The XRD pattern of starting IONPs matches well with the PDF, indicating that the starting materials are γ-Fe 2 O 3 . These IONPs are then reduced by hydrogen gas to get rid of oxygen and create preferable microstructures for the following nitriding process. − After nitriding, the XRD patterns show that the main phase is γ′-Fe 4 N. Thus, γ′-Fe 4 N nanoparticles are successfully synthesized by the gas nitriding approach. The ball-and-stick models of γ-Fe 2 O 3 and γ′-Fe 4 N are shown in Figure d to provide a brief view of how the crystal structure changes from γ-Fe 2 O 3 to reduced Fe and synthesized γ′-Fe 4 N.…”

Section: Resultsmentioning

confidence: 99%

Stable and Monodisperse Iron Nitride Nanoparticle Suspension for Magnetic Diagnosis and Treatment: Development of Synthesis and Surface Functionalization Strategies

Liu

Saha

et al. 2021

ACS Appl. Nano Mater.

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The past decade has seen tremendous progress in the synthesis and surface functionalization of iron oxide nanoparticles (IONPs) for a variety of biomedical applications. However, there is still a growing demand on magnetic nanoparticles with higher magnetic moments for more sensitive diagnosis and lower dose treatments in magnetic bioassays, imaging, and therapies. In view of this need, the γ′-Fe 4 N nanoparticle, with around 3 times higher saturation magnetizations than IONPs, becomes one promising alternative for these applications. However, the large and non-uniformly distributed sizes of γ′-Fe 4 N nanoparticles hinder the biomedical applications. These synthesized γ′-Fe 4 N nanoparticles are not suitable for biomedical applications at the current stage. Herein, we have developed and demonstrated a wet ball milling method along with different surface-active media to produce ultrastable, monodispersed, uniformly sized, and sub-100 nm γ′-Fe 4 N nanoparticles in solvents. Different standard characterization methods such as transmission electron microscopy, nanoparticle tracking analysis, and Fourier-transform infrared spectroscopy are carried out to measure the physicochemical properties of these surface-functionalized γ′-Fe 4 N nanoparticles. It is confirmed that the functional chemical groups have been successfully anchored on our purified sub-100 nm γ′-Fe 4 N nanoparticles, which allows for convenient subsequent conjugation of proteins, nucleic acids, and drugs for future in vitro and in vivo biomedical applications.

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“…As proposed by the Lehrer diagram, the most stable iron nitride phase could be modified by tuning the nitriding potential that is controlled by the partial pressure of hydrogen and ammonia gas and the nitridation temperature . Thus, different iron nitride phases are obtained using the gas nitridation process, such as α″-Fe 16 N 2 , γ′-Fe 4 N, γ-FeN, ε-Fe- 3 N, and so forth. − In this paper, we report the gas nitridation method to synthesize γ′-Fe 4 N nanoparticles. During the nitridation process, ammonia gas provides nitrogen atoms and hydrogen gas is applied to tune the nitriding potential to obtain γ′-Fe 4 N nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Irregularly Shaped Iron Nitride Nanoparticles as a Potential Candidate for Biomedical Applications: From Synthesis to Characterization

Saha

et al. 2020

ACS Omega

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Magnetic nanoparticles (MNPs) have been extensively used in drug/gene delivery, hyperthermia therapy, magnetic particle imaging (MPI), magnetic resonance imaging (MRI), magnetic bioassays, and so forth. With proper surface chemical modifications, physicochemically stable and nontoxic MNPs are emerging contrast agents and tracers for in vivo MRI and MPI applications. Herein, we report the high magnetic moment, irregularly shaped γ′-Fe4N nanoparticles for enhanced hyperthermia therapy and T2 contrast agent for MRI application. The static and dynamic magnetic properties of γ′-Fe4N nanoparticles are characterized by a vibrating sample magnetometer (VSM) and a magnetic particle spectroscopy (MPS) system, respectively. Compared to the γ-Fe2O3 nanoparticles, γ′-Fe4N nanoparticles show at least three times higher saturation magnetization, which, as a result, gives rise to the stronger dynamic magnetic responses as proved in the MPS measurement results. In addition, γ′-Fe4N nanoparticles are functionalized with an oleic acid layer by a wet mechanical milling process. The morphologies of as-milled nanoparticles are characterized by transmission electron microscopy (TEM), dynamic light scattering (DLS), and nanoparticle tracking analyzer (NTA). We report that with proper surface chemical modification and tuning on morphologies, γ′-Fe4N nanoparticles could be used as tiny heating sources for hyperthermia and contrast agents for MRI applications with minimum dose.

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Synthesis of α′′-Fe₁₆N₂ribbons with a porous structure

Abstract: The microstructure of FeCuB ribbons (∼20 μm thick) was modified to fabricate α′′-Fe16N2at a temperature as low as 160 °C.

Cited by 22 publications

References 34 publications

Martensitic αʺ-Fe16N2-Type Phase of Non-Stoichiometric Composition: Current Status of Research and Microscopic Statistical-Thermodynamic Model

Martensitic αʺ-Fe16N2-Type Phase of Non-Stoichiometric Composition: Current Status of Research and Microscopic Statistical-Thermodynamic Model

Stable and Monodisperse Iron Nitride Nanoparticle Suspension for Magnetic Diagnosis and Treatment: Development of Synthesis and Surface Functionalization Strategies

Irregularly Shaped Iron Nitride Nanoparticles as a Potential Candidate for Biomedical Applications: From Synthesis to Characterization

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Synthesis of α′′-Fe16N2ribbons with a porous structure

Abstract: The microstructure of FeCuB ribbons (∼20 μm thick) was modified to fabricate α′′-Fe16N2at a temperature as low as 160 °C.

Cited by 22 publications

References 34 publications

Martensitic αʺ-Fe16N2-Type Phase of Non-Stoichiometric Composition: Current Status of Research and Microscopic Statistical-Thermodynamic Model

Martensitic αʺ-Fe16N2-Type Phase of Non-Stoichiometric Composition: Current Status of Research and Microscopic Statistical-Thermodynamic Model

Stable and Monodisperse Iron Nitride Nanoparticle Suspension for Magnetic Diagnosis and Treatment: Development of Synthesis and Surface Functionalization Strategies

Irregularly Shaped Iron Nitride Nanoparticles as a Potential Candidate for Biomedical Applications: From Synthesis to Characterization

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Synthesis of α′′-Fe₁₆N₂ribbons with a porous structure